692 lines
16 KiB
C
692 lines
16 KiB
C
/* iksemel (XML parser for Jabber)
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** Copyright (C) 2000-2007 Gurer Ozen <madcat@e-kolay.net>
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** This code is free software; you can redistribute it and/or
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** modify it under the terms of GNU Lesser General Public License.
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*/
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#include "config.h"
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#ifdef HAVE_GNUTLS
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#define _XOPEN_SOURCE 500
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#define _GNU_SOURCE
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#include <pthread.h>
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#endif
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#include "common.h"
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#include "iksemel.h"
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#ifdef HAVE_GNUTLS
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#include <gnutls/gnutls.h>
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#endif
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#define SF_FOREIGN 1
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#define SF_TRY_SECURE 2
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#define SF_SECURE 4
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struct stream_data {
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iksparser *prs;
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ikstack *s;
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ikstransport *trans;
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char *name_space;
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void *user_data;
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const char *server;
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iksStreamHook *streamHook;
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iksLogHook *logHook;
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iks *current;
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char *buf;
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void *sock;
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unsigned int flags;
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char *auth_username;
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char *auth_pass;
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#ifdef HAVE_GNUTLS
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gnutls_session sess;
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gnutls_certificate_credentials cred;
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#endif
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};
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#ifdef HAVE_GNUTLS
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#ifndef WIN32
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#include <gcrypt.h>
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GCRY_THREAD_OPTION_PTHREAD_IMPL;
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#endif
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static size_t
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tls_push (iksparser *prs, const char *buffer, size_t len)
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{
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struct stream_data *data = iks_user_data (prs);
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int ret;
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ret = data->trans->send (data->sock, buffer, len);
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if (ret) return (size_t) -1;
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return len;
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}
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static size_t
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tls_pull (iksparser *prs, char *buffer, size_t len)
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{
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struct stream_data *data = iks_user_data (prs);
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int ret;
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ret = data->trans->recv (data->sock, buffer, len, -1);
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if (ret == -1) return (size_t) -1;
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return ret;
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}
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static int
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handshake (struct stream_data *data)
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{
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const int protocol_priority[] = { GNUTLS_TLS1, GNUTLS_SSL3, 0 };
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const int kx_priority[] = { GNUTLS_KX_RSA, 0 };
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const int cipher_priority[] = { GNUTLS_CIPHER_3DES_CBC, GNUTLS_CIPHER_ARCFOUR, 0};
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const int comp_priority[] = { GNUTLS_COMP_ZLIB, GNUTLS_COMP_NULL, 0 };
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const int mac_priority[] = { GNUTLS_MAC_SHA, GNUTLS_MAC_MD5, 0 };
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int ret;
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#ifndef WIN32
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gcry_control(GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread);
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#endif
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if (gnutls_global_init () != 0)
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return IKS_NOMEM;
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if (gnutls_certificate_allocate_credentials (&data->cred) < 0)
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return IKS_NOMEM;
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if (gnutls_init (&data->sess, GNUTLS_CLIENT) != 0) {
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gnutls_certificate_free_credentials (data->cred);
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return IKS_NOMEM;
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}
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gnutls_protocol_set_priority (data->sess, protocol_priority);
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gnutls_cipher_set_priority(data->sess, cipher_priority);
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gnutls_compression_set_priority(data->sess, comp_priority);
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gnutls_kx_set_priority(data->sess, kx_priority);
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gnutls_mac_set_priority(data->sess, mac_priority);
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gnutls_credentials_set (data->sess, GNUTLS_CRD_CERTIFICATE, data->cred);
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gnutls_transport_set_push_function (data->sess, (gnutls_push_func) tls_push);
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gnutls_transport_set_pull_function (data->sess, (gnutls_pull_func) tls_pull);
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gnutls_transport_set_ptr (data->sess, data->prs);
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ret = gnutls_handshake (data->sess);
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if (ret != 0) {
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gnutls_deinit (data->sess);
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gnutls_certificate_free_credentials (data->cred);
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return IKS_NET_TLSFAIL;
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}
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data->flags &= (~SF_TRY_SECURE);
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data->flags |= SF_SECURE;
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iks_send_header (data->prs, data->server);
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return IKS_OK;
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}
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#endif
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static void
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insert_attribs (iks *x, char **atts)
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{
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if (atts) {
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int i = 0;
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while (atts[i]) {
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iks_insert_attrib (x, atts[i], atts[i+1]);
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i += 2;
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}
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}
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}
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#define CNONCE_LEN 4
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static void
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parse_digest (char *message, const char *key, char **value_ptr, char **value_end_ptr)
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{
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char *t;
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*value_ptr = NULL;
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*value_end_ptr = NULL;
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t = strstr(message, key);
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if (t) {
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t += strlen(key);
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*value_ptr = t;
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while (t[0] != '\0') {
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if (t[0] != '\\' && t[1] == '"') {
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++t;
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*value_end_ptr = t;
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return;
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}
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++t;
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}
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}
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}
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static iks *
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make_sasl_response (struct stream_data *data, char *message)
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{
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iks *x = NULL;
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char *realm, *realm_end;
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char *nonce, *nonce_end;
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char cnonce[CNONCE_LEN*8 + 1];
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iksmd5 *md5;
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unsigned char a1_h[16], a1[33], a2[33], response_value[33];
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char *response, *response_coded;
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int i;
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parse_digest(message, "realm=\"", &realm, &realm_end);
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parse_digest(message, "nonce=\"", &nonce, &nonce_end);
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/* nonce is necessary for auth */
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if (!nonce || !nonce_end) return NULL;
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*nonce_end = '\0';
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/* if no realm is given use the server hostname */
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if (realm) {
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if (!realm_end) return NULL;
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*realm_end = '\0';
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} else {
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realm = (char *) data->server;
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}
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/* generate random client challenge */
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for (i = 0; i < CNONCE_LEN; ++i)
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sprintf (cnonce + i*8, "%08x", rand());
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md5 = iks_md5_new();
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if (!md5) return NULL;
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iks_md5_hash (md5, (const unsigned char*)data->auth_username, iks_strlen (data->auth_username), 0);
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iks_md5_hash (md5, (const unsigned char*)":", 1, 0);
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iks_md5_hash (md5, (const unsigned char*)realm, iks_strlen (realm), 0);
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iks_md5_hash (md5, (const unsigned char*)":", 1, 0);
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iks_md5_hash (md5, (const unsigned char*)data->auth_pass, iks_strlen (data->auth_pass), 1);
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iks_md5_digest (md5, a1_h);
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iks_md5_reset (md5);
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iks_md5_hash (md5, (const unsigned char*)a1_h, 16, 0);
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iks_md5_hash (md5, (const unsigned char*)":", 1, 0);
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iks_md5_hash (md5, (const unsigned char*)nonce, iks_strlen (nonce), 0);
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iks_md5_hash (md5, (const unsigned char*)":", 1, 0);
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iks_md5_hash (md5, (const unsigned char*)cnonce, iks_strlen (cnonce), 1);
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iks_md5_print (md5, (char*)a1);
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iks_md5_reset (md5);
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iks_md5_hash (md5, (const unsigned char*)"AUTHENTICATE:xmpp/", 18, 0);
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iks_md5_hash (md5, (const unsigned char*)data->server, iks_strlen (data->server), 1);
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iks_md5_print (md5, (char*)a2);
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iks_md5_reset (md5);
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iks_md5_hash (md5, (const unsigned char*)a1, 32, 0);
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iks_md5_hash (md5, (const unsigned char*)":", 1, 0);
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iks_md5_hash (md5, (const unsigned char*)nonce, iks_strlen (nonce), 0);
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iks_md5_hash (md5, (const unsigned char*)":00000001:", 10, 0);
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iks_md5_hash (md5, (const unsigned char*)cnonce, iks_strlen (cnonce), 0);
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iks_md5_hash (md5, (const unsigned char*)":auth:", 6, 0);
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iks_md5_hash (md5, (const unsigned char*)a2, 32, 1);
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iks_md5_print (md5, (char*)response_value);
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iks_md5_delete (md5);
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i = iks_strlen (data->auth_username) + iks_strlen (realm) +
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iks_strlen (nonce) + iks_strlen (data->server) +
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CNONCE_LEN*8 + 136;
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response = iks_malloc (i);
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if (!response) return NULL;
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sprintf (response, "username=\"%s\",realm=\"%s\",nonce=\"%s\""
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",cnonce=\"%s\",nc=00000001,qop=auth,digest-uri=\""
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"xmpp/%s\",response=%s,charset=utf-8",
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data->auth_username, realm, nonce, cnonce,
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data->server, response_value);
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response_coded = iks_base64_encode (response, 0);
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if (response_coded) {
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x = iks_new ("response");
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iks_insert_cdata (x, response_coded, 0);
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iks_free (response_coded);
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}
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iks_free (response);
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return x;
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}
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static void
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iks_sasl_challenge (struct stream_data *data, iks *challenge)
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{
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char *message;
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iks *x;
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char *tmp;
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tmp = iks_cdata (iks_child (challenge));
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if (!tmp) return;
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/* decode received blob */
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message = iks_base64_decode (tmp);
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if (!message) return;
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/* reply the challenge */
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if (strstr (message, "rspauth")) {
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x = iks_new ("response");
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} else {
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x = make_sasl_response (data, message);
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}
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if (x) {
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iks_insert_attrib (x, "xmlns", IKS_NS_XMPP_SASL);
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iks_send (data->prs, x);
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iks_delete (x);
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}
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iks_free (message);
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}
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static int
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tagHook (struct stream_data *data, char *name, char **atts, int type)
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{
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iks *x;
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int err;
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switch (type) {
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case IKS_OPEN:
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case IKS_SINGLE:
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#ifdef HAVE_GNUTLS
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if (data->flags & SF_TRY_SECURE) {
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if (strcmp (name, "proceed") == 0) {
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err = handshake (data);
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return err;
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} else if (strcmp (name, "failure") == 0){
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return IKS_NET_TLSFAIL;
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}
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}
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#endif
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if (data->current) {
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x = iks_insert (data->current, name);
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insert_attribs (x, atts);
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} else {
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x = iks_new (name);
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insert_attribs (x, atts);
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if (iks_strcmp (name, "stream:stream") == 0) {
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err = data->streamHook (data->user_data, IKS_NODE_START, x);
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if (err != IKS_OK) return err;
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break;
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}
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}
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data->current = x;
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if (IKS_OPEN == type) break;
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case IKS_CLOSE:
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x = data->current;
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if (NULL == x) {
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err = data->streamHook (data->user_data, IKS_NODE_STOP, NULL);
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if (err != IKS_OK) return err;
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break;
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}
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if (NULL == iks_parent (x)) {
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data->current = NULL;
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if (iks_strcmp (name, "challenge") == 0)
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iks_sasl_challenge(data, x);
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else if (iks_strcmp (name, "stream:error") == 0) {
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err = data->streamHook (data->user_data, IKS_NODE_ERROR, x);
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if (err != IKS_OK) return err;
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} else {
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err = data->streamHook (data->user_data, IKS_NODE_NORMAL, x);
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if (err != IKS_OK) return err;
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}
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break;
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}
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data->current = iks_parent (x);
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}
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return IKS_OK;
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}
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static int
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cdataHook (struct stream_data *data, char *cdata, size_t len)
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{
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if (data->current) iks_insert_cdata (data->current, cdata, len);
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return IKS_OK;
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}
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static void
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deleteHook (struct stream_data *data)
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{
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#ifdef HAVE_GNUTLS
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if (data->flags & SF_SECURE) {
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gnutls_bye (data->sess, GNUTLS_SHUT_WR);
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gnutls_deinit (data->sess);
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gnutls_certificate_free_credentials (data->cred);
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}
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#endif
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if (data->trans) data->trans->close (data->sock);
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data->trans = NULL;
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if (data->current) iks_delete (data->current);
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data->current = NULL;
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data->flags = 0;
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}
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iksparser *
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iks_stream_new (char *name_space, void *user_data, iksStreamHook *streamHook)
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{
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ikstack *s;
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struct stream_data *data;
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s = iks_stack_new (DEFAULT_STREAM_CHUNK_SIZE, 0);
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if (NULL == s) return NULL;
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data = iks_stack_alloc (s, sizeof (struct stream_data));
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memset (data, 0, sizeof (struct stream_data));
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data->s = s;
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data->prs = iks_sax_extend (s, data, (iksTagHook *)tagHook, (iksCDataHook *)cdataHook, (iksDeleteHook *)deleteHook);
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data->name_space = name_space;
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data->user_data = user_data;
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data->streamHook = streamHook;
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return data->prs;
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}
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void *
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iks_stream_user_data (iksparser *prs)
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{
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struct stream_data *data = iks_user_data (prs);
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return data->user_data;
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}
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void
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iks_set_log_hook (iksparser *prs, iksLogHook *logHook)
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{
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struct stream_data *data = iks_user_data (prs);
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data->logHook = logHook;
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}
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int
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iks_connect_tcp (iksparser *prs, const char *server, int port)
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{
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#ifdef USE_DEFAULT_IO
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return iks_connect_with (prs, server, port, server, &iks_default_transport);
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#else
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return IKS_NET_NOTSUPP;
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#endif
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}
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int
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iks_connect_via (iksparser *prs, const char *server, int port, const char *server_name)
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{
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#ifdef USE_DEFAULT_IO
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return iks_connect_with (prs, server, port, server_name, &iks_default_transport);
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#else
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return IKS_NET_NOTSUPP;
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#endif
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}
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int
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iks_connect_with (iksparser *prs, const char *server, int port, const char *server_name, ikstransport *trans)
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{
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struct stream_data *data = iks_user_data (prs);
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int ret;
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if (!trans->connect) return IKS_NET_NOTSUPP;
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if (!data->buf) {
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data->buf = iks_stack_alloc (data->s, NET_IO_BUF_SIZE);
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if (NULL == data->buf) return IKS_NOMEM;
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}
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ret = trans->connect (prs, &data->sock, server, port);
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if (ret) return ret;
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data->trans = trans;
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return iks_send_header (prs, server_name);
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}
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int
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iks_connect_async (iksparser *prs, const char *server, int port, void *notify_data, iksAsyncNotify *notify_func)
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{
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#ifdef USE_DEFAULT_IO
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return iks_connect_async_with (prs, server, port, server, &iks_default_transport, notify_data, notify_func);
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#else
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return IKS_NET_NOTSUPP;
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#endif
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}
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int
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iks_connect_async_with (iksparser *prs, const char *server, int port, const char *server_name, ikstransport *trans, void *notify_data, iksAsyncNotify *notify_func)
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{
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struct stream_data *data = iks_user_data (prs);
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int ret;
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if (NULL == trans->connect_async)
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return IKS_NET_NOTSUPP;
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if (!data->buf) {
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data->buf = iks_stack_alloc (data->s, NET_IO_BUF_SIZE);
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if (NULL == data->buf) return IKS_NOMEM;
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}
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ret = trans->connect_async (prs, &data->sock, server, server_name, port, notify_data, notify_func);
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if (ret) return ret;
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data->trans = trans;
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data->server = server_name;
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return IKS_OK;
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}
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int
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iks_connect_fd (iksparser *prs, int fd)
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{
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#ifdef USE_DEFAULT_IO
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struct stream_data *data = iks_user_data (prs);
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if (!data->buf) {
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data->buf = iks_stack_alloc (data->s, NET_IO_BUF_SIZE);
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if (NULL == data->buf) return IKS_NOMEM;
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}
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data->sock = (void *) fd;
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data->flags |= SF_FOREIGN;
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data->trans = &iks_default_transport;
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return IKS_OK;
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#else
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return IKS_NET_NOTSUPP;
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#endif
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}
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int
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iks_fd (iksparser *prs)
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{
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struct stream_data *data;
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if (prs) {
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data = iks_user_data (prs);
|
|
if (data) {
|
|
return (int) data->sock;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
iks_recv (iksparser *prs, int timeout)
|
|
{
|
|
struct stream_data *data = iks_user_data (prs);
|
|
int len, ret;
|
|
|
|
while (1) {
|
|
#ifdef HAVE_GNUTLS
|
|
if (data->flags & SF_SECURE) {
|
|
len = gnutls_record_recv (data->sess, data->buf, NET_IO_BUF_SIZE - 1);
|
|
if (len == 0) len = -1;
|
|
} else
|
|
#endif
|
|
{
|
|
len = data->trans->recv (data->sock, data->buf, NET_IO_BUF_SIZE - 1, timeout);
|
|
}
|
|
if (len < 0) return IKS_NET_RWERR;
|
|
if (len == 0) break;
|
|
data->buf[len] = '\0';
|
|
if (data->logHook) data->logHook (data->user_data, data->buf, len, 1);
|
|
ret = iks_parse (prs, data->buf, len, 0);
|
|
if (ret != IKS_OK) return ret;
|
|
if (!data->trans) {
|
|
/* stream hook called iks_disconnect */
|
|
return IKS_NET_NOCONN;
|
|
}
|
|
timeout = 0;
|
|
}
|
|
return IKS_OK;
|
|
}
|
|
|
|
int
|
|
iks_send_header (iksparser *prs, const char *to)
|
|
{
|
|
struct stream_data *data = iks_user_data (prs);
|
|
char *msg;
|
|
int len, err;
|
|
|
|
len = 91 + strlen (data->name_space) + 6 + strlen (to) + 16 + 1;
|
|
msg = iks_malloc (len);
|
|
if (!msg) return IKS_NOMEM;
|
|
sprintf (msg, "<?xml version='1.0'?>"
|
|
"<stream:stream xmlns:stream='http://etherx.jabber.org/streams' xmlns='"
|
|
"%s' to='%s' version='1.0'>", data->name_space, to);
|
|
err = iks_send_raw (prs, msg);
|
|
iks_free (msg);
|
|
if (err) return err;
|
|
data->server = to;
|
|
return IKS_OK;
|
|
}
|
|
|
|
int
|
|
iks_send (iksparser *prs, iks *x)
|
|
{
|
|
return iks_send_raw (prs, iks_string (iks_stack (x), x));
|
|
}
|
|
|
|
int
|
|
iks_send_raw (iksparser *prs, const char *xmlstr)
|
|
{
|
|
struct stream_data *data = iks_user_data (prs);
|
|
int ret;
|
|
|
|
#ifdef HAVE_GNUTLS
|
|
if (data->flags & SF_SECURE) {
|
|
if (gnutls_record_send (data->sess, xmlstr, strlen (xmlstr)) < 0) return IKS_NET_RWERR;
|
|
} else
|
|
#endif
|
|
{
|
|
ret = data->trans->send (data->sock, xmlstr, strlen (xmlstr));
|
|
if (ret) return ret;
|
|
}
|
|
if (data->logHook) data->logHook (data->user_data, xmlstr, strlen (xmlstr), 0);
|
|
return IKS_OK;
|
|
}
|
|
|
|
void
|
|
iks_disconnect (iksparser *prs)
|
|
{
|
|
iks_parser_reset (prs);
|
|
}
|
|
|
|
/***** tls api *****/
|
|
|
|
int
|
|
iks_has_tls (void)
|
|
{
|
|
#ifdef HAVE_GNUTLS
|
|
return 1;
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
int
|
|
iks_is_secure (iksparser *prs)
|
|
{
|
|
#ifdef HAVE_GNUTLS
|
|
struct stream_data *data = iks_user_data (prs);
|
|
|
|
return data->flags & SF_SECURE;
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
#ifdef HAVE_GNUTLS
|
|
|
|
|
|
int
|
|
iks_init(void)
|
|
{
|
|
int ok = 0;
|
|
|
|
#ifndef WIN32
|
|
gcry_control(GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread);
|
|
#endif
|
|
|
|
if (gnutls_global_init () != 0)
|
|
return IKS_NOMEM;
|
|
|
|
return ok;
|
|
|
|
}
|
|
#else
|
|
int
|
|
iks_init(void)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
|
|
int
|
|
iks_start_tls (iksparser *prs)
|
|
{
|
|
#ifdef HAVE_GNUTLS
|
|
int ret;
|
|
struct stream_data *data = iks_user_data (prs);
|
|
|
|
ret = iks_send_raw (prs, "<starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>");
|
|
if (ret) return ret;
|
|
data->flags |= SF_TRY_SECURE;
|
|
return IKS_OK;
|
|
#else
|
|
return IKS_NET_NOTSUPP;
|
|
#endif
|
|
}
|
|
|
|
/***** sasl *****/
|
|
|
|
int
|
|
iks_start_sasl (iksparser *prs, enum ikssasltype type, char *username, char *pass)
|
|
{
|
|
iks *x;
|
|
|
|
x = iks_new ("auth");
|
|
iks_insert_attrib (x, "xmlns", IKS_NS_XMPP_SASL);
|
|
switch (type) {
|
|
case IKS_SASL_PLAIN: {
|
|
int len = iks_strlen (username) + iks_strlen (pass) + 2;
|
|
char *s = iks_malloc (80+len);
|
|
char *base64;
|
|
|
|
iks_insert_attrib (x, "mechanism", "PLAIN");
|
|
sprintf (s, "%c%s%c%s", 0, username, 0, pass);
|
|
base64 = iks_base64_encode (s, len);
|
|
iks_insert_cdata (x, base64, 0);
|
|
iks_free (base64);
|
|
iks_free (s);
|
|
break;
|
|
}
|
|
case IKS_SASL_DIGEST_MD5: {
|
|
struct stream_data *data = iks_user_data (prs);
|
|
|
|
iks_insert_attrib (x, "mechanism", "DIGEST-MD5");
|
|
data->auth_username = username;
|
|
data->auth_pass = pass;
|
|
break;
|
|
}
|
|
default:
|
|
iks_delete (x);
|
|
return IKS_NET_NOTSUPP;
|
|
}
|
|
iks_send (prs, x);
|
|
iks_delete (x);
|
|
return IKS_OK;
|
|
}
|