X-Git-Url: http://git.pk910.de/?p=ircu2.10.12-pk.git;a=blobdiff_plain;f=ircd%2Fssl.gnutls.c;fp=ircd%2Fssl.gnutls.c;h=1b0854098af7f244c37a6a4e104286d9a45b0ecc;hp=0000000000000000000000000000000000000000;hb=f26079b861fde8de42f9e2db5a0f1a9330ce1ed5;hpb=99ba4795414c55c34fb778da3b3b0563170212a5

diff --git a/ircd/ssl.gnutls.c b/ircd/ssl.gnutls.c
new file mode 100644
index 0000000..1b08540
--- /dev/null
+++ b/ircd/ssl.gnutls.c
@@ -0,0 +1,385 @@
+/*
+ * IRC - Internet Relay Chat, ircd/ssl.gnutls.c
+ * Copyright (C) 2015 pk910 (Philipp Kreil)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 1, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+/** @file
+ * @brief Implementation of functions for handling ssl connections
+ * @version $Id$
+ */
+#include <gnutls/gnutls.h>
+
+#ifndef GNUTLS_SEC_PARAM_LEGACY
+#define GNUTLS_SEC_PARAM_LEGACY 2
+#endif
+ 
+struct SSLPendingConections {
+  struct SSLConnection *connection;
+  struct SSLPendingConections *next;
+  
+  void *data;
+  enum SSLDataType datatype;
+};
+
+struct SSLPendingConections *firstPendingConection = NULL;
+int ssl_is_initialized = 0;
+static gnutls_dh_params_t ssl_dh_params;
+static unsigned int ssl_dh_params_bits;
+
+static int ssl_generate_dh_params() {
+  ssl_dh_params_bits = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, GNUTLS_SEC_PARAM_LEGACY);
+  gnutls_dh_params_init(&ssl_dh_params);
+  gnutls_dh_params_generate2(ssl_dh_params, ssl_dh_params_bits);
+  return 0;
+}
+
+static void ssl_init() {
+  if(ssl_is_initialized)
+    return;
+  ssl_is_initialized = 1;
+  int res;
+  res = gnutls_global_init();
+  
+  if(res != GNUTLS_E_SUCCESS) {
+    //TODO: Log Errors
+  }
+}
+
+void ssl_free_connection(struct SSLConnection *connection) {
+  gnutls_bye(connection->session, GNUTLS_SHUT_RDWR);
+  if(connection->credentials)
+    gnutls_certificate_free_credentials(connection->credentials);
+  gnutls_deinit(connection->session);
+  free(connection);
+}
+
+void ssl_free_listener(struct SSLListener *listener) {
+  gnutls_certificate_free_credentials(listener->credentials);
+  gnutls_priority_deinit(listener->priority);
+  free(listener);
+}
+
+static void ssl_handshake_completed(struct SSLConnection *connection, int success) {
+  struct SSLPendingConections *pending, *lastPending = NULL;
+  for(pending = firstPendingConection; pending; pending = pending->next) {
+    if(pending->connection == connection) {
+      if(lastPending)
+        lastPending->next = pending->next;
+      else
+        firstPendingConection = pending->next;
+      switch(pending->datatype) {
+        case SSLData_Client: {
+            struct Client *cptr = (struct Client *) pending->data;
+            if(success) {
+              if(FlagHas(&connection->flags, SSLFLAG_INCOMING))
+                start_auth(cptr);
+              else if(!completed_connection(cptr))
+                exit_client_msg(cptr, cptr, &me, "Registration failed.");
+            } else
+              exit_client_msg(cptr, cptr, &me, "SSL Handshake failed.");
+          }
+          break;
+      }
+      free(pending);
+    }
+    lastPending = pending;
+  }
+}
+
+static int ssl_handshake_outgoing(struct SSLConnection *connection) {
+  int ret = gnutls_handshake(connection->session);
+  FlagClr(&connection->flags, SSLFLAG_HANDSHAKE_R);
+  FlagClr(&connection->flags, SSLFLAG_HANDSHAKE_W);
+  
+  if(ret < 0) {
+    if(gnutls_error_is_fatal(ret) == 0) {
+      if(gnutls_record_get_direction(connection->session))
+        FlagSet(&connection->flags, SSLFLAG_HANDSHAKE_W);
+      else
+        FlagSet(&connection->flags, SSLFLAG_HANDSHAKE_R);
+      return 1;
+    } else {
+      
+      return 0;
+    }
+  } else {
+    FlagClr(&connection->flags, SSLFLAG_HANDSHAKE);
+    FlagSet(&connection->flags, SSLFLAG_READY);
+    ssl_handshake_completed(connection, 1);
+    return 0;
+  }
+}
+
+struct SSLConnection *ssl_create_connect(int fd, void *data, enum SSLDataType datatype) {
+  struct SSLConnection *connection = malloc(sizeof(*connection));
+  struct SSLPendingConections *pending = NULL;
+  
+  if(!connection)
+    return NULL;
+  
+  if(!ssl_is_initialized)
+    ssl_init();
+  
+  gnutls_certificate_allocate_credentials(&connection->credentials);
+  gnutls_init(&connection->session, GNUTLS_CLIENT);
+  
+  gnutls_priority_set_direct(connection->session, "SECURE128:+SECURE192:-VERS-TLS-ALL:+VERS-TLS1.2", NULL);
+  gnutls_credentials_set(connection->session, GNUTLS_CRD_CERTIFICATE, connection->credentials);
+  
+  gnutls_transport_set_ptr(connection->session, (gnutls_transport_ptr_t)fd);
+  //gnutls_handshake_set_timeout(connection->session, 30);
+  
+  FlagSet(&connection->flags, SSLFLAG_OUTGOING);
+  FlagSet(&connection->flags, SSLFLAG_HANDSHAKE);
+  
+  pending = malloc(sizeof(*pending));
+  if(!pending) {
+    goto ssl_create_connect_failed;
+  }
+  pending->connection = connection;
+  pending->next = firstPendingConection;
+  firstPendingConection = pending;
+  
+  pending->data = data;
+  pending->datatype = datatype;
+  
+  ssl_handshake_outgoing(connection);
+  
+  return connection;
+ssl_create_connect_failed:
+  free(connection);
+  return NULL;
+}
+
+void ssl_start_handshake_connect(struct SSLConnection *connection) {
+  ssl_handshake_outgoing(connection);
+}
+
+struct SSLListener *ssl_create_listener() {
+  if(!ssl_is_initialized)
+    ssl_init();
+  
+  struct SSLListener *listener = calloc(1, sizeof(*listener));
+  
+  gnutls_priority_init(&listener->priority, "SECURE128:+SECURE192:-VERS-TLS-ALL:+VERS-TLS1.2", NULL);
+  gnutls_certificate_allocate_credentials(&listener->credentials);
+  
+  char *certfile = conf_get_local()->sslcertfile;
+  char *keyfile = conf_get_local()->sslkeyfile;
+  char *cafile = conf_get_local()->sslcafile;
+  
+  if(!certfile) {
+    goto ssl_create_listener_failed;
+  }
+  if(!keyfile) {
+    keyfile = certfile;
+  }
+  
+  /* load certificate */
+  if(gnutls_certificate_set_x509_key_file(listener->credentials, certfile, keyfile, GNUTLS_X509_FMT_PEM) < 0) {
+    goto ssl_create_listener_failed;
+  }
+  /* load cafile */
+  //TODO: ca file check!
+  /*
+  if(cafile && cafile[0] && SSL_CTX_load_verify_locations(listener->context, cafile, NULL) <= 0) {
+    goto ssl_create_listener_failed;
+  }
+  */
+  
+  gnutls_certificate_set_dh_params(listener->credentials, ssl_dh_params);
+  
+  FlagSet(&listener->flags, SSLFLAG_READY);
+  return listener;
+ssl_create_listener_failed:
+  free(listener);
+  return NULL;
+}
+
+struct SSLConnection *ssl_start_handshake_listener(struct SSLListener *listener, int fd, void *data, enum SSLDataType datatype) {
+  if(!listener)
+    return NULL;
+  struct SSLPendingConections *pending = NULL;
+  struct SSLConnection *connection = malloc(sizeof(*connection));
+  
+  gnutls_init(&connection->session, GNUTLS_SERVER);
+  gnutls_priority_set(connection->session, listener->priority);
+  gnutls_credentials_set(connection->session, GNUTLS_CRD_CERTIFICATE, listener->credentials);
+  connection->credentials = NULL;
+  gnutls_dh_set_prime_bits(connection->session, ssl_dh_params_bits);
+  gnutls_certificate_server_set_request(connection->session, GNUTLS_CERT_IGNORE);
+  
+  gnutls_transport_set_ptr(connection->session, (gnutls_transport_ptr_t)fd);
+  
+  FlagSet(&connection->flags, SSLFLAG_INCOMING);
+  FlagSet(&connection->flags, SSLFLAG_HANDSHAKE);
+  FlagSet(&connection->flags, SSLFLAG_HANDSHAKE_R);
+  
+  pending = malloc(sizeof(*pending));
+  if(!pending) {
+    goto ssl_start_handshake_listener_failed;
+  }
+  pending->connection = connection;
+  pending->next = firstPendingConection;
+  firstPendingConection = pending;
+  
+  pending->data = data;
+  pending->datatype = datatype;
+  
+  ssl_handshake_outgoing(connection);
+  return connection;
+ssl_start_handshake_listener_failed:
+  free(connection);
+  return NULL;
+}
+
+IOResult ssl_recv_decrypt(struct SSLConnection *connection, char *buf, unsigned int buflen, unsigned int *len) {
+  if(FlagHas(&connection->flags, SSLFLAG_HANDSHAKE)) {
+    ssl_handshake_outgoing(connection);
+    return IO_BLOCKED;
+  }
+  
+  int ret = gnutls_record_recv(connection->session, buf, buflen);
+  
+  if(ret == 0) {
+    return IO_FAILURE;
+  } else if(ret < 0 && gnutls_error_is_fatal(ret) == 0) {
+    if(ret == GNUTLS_E_REHANDSHAKE) {
+      FlagSet(&connection->flags, SSLFLAG_HANDSHAKE);
+      ssl_handshake_outgoing(connection);
+      return IO_BLOCKED;
+    }
+  } else if(ret < 0) {
+    return IO_FAILURE;
+  }
+  *len = ret;
+  return IO_SUCCESS;
+}
+
+static ssize_t ssl_writev(gnutls_session_t ssl, const struct iovec *vector, int count) {
+  char *buffer;
+  register char *bp;
+  size_t bytes, to_copy;
+  int i;
+
+  /* Find the total number of bytes to be written.  */
+  bytes = 0;
+  for (i = 0; i < count; ++i)
+    bytes += vector[i].iov_len;
+
+  /* Allocate a temporary buffer to hold the data.  */
+  buffer = (char *) alloca (bytes);
+
+  /* Copy the data into BUFFER.  */
+  to_copy = bytes;
+  bp = buffer;
+  for (i = 0; i < count; ++i) {
+    size_t copy = ((vector[i].iov_len) > (to_copy) ? (to_copy) : (vector[i].iov_len));
+    memcpy ((void *) bp, (void *) vector[i].iov_base, copy);
+    bp += copy;
+    to_copy -= copy;
+    if (to_copy == 0)
+      break;
+  }
+  return gnutls_record_send(ssl, buffer, bytes);
+}
+
+IOResult ssl_send_encrypt_plain(struct SSLConnection *connection, char* buf, int len) {
+  return gnutls_record_send(connection->session, buf, len);
+}
+
+IOResult ssl_send_encrypt(struct SSLConnection *connection, struct MsgQ* buf, unsigned int *count_in, unsigned int *count_out) {
+  int res;
+  int count;
+  struct iovec iov[IOV_MAX];
+
+  assert(0 != buf);
+  assert(0 != count_in);
+  assert(0 != count_out);
+
+  *count_in = 0;
+  count = msgq_mapiov(buf, iov, IOV_MAX, count_in);
+  res = ssl_writev(connection->session, iov, count);
+
+  if(res == 0) {
+    *count_out = 0;
+    return IO_FAILURE;
+  } else if(res < 0 && gnutls_error_is_fatal(res) == 0) {
+    if(res == GNUTLS_E_REHANDSHAKE) {
+      FlagSet(&connection->flags, SSLFLAG_HANDSHAKE);
+      ssl_handshake_outgoing(connection);
+      return IO_BLOCKED;
+    }
+  } else if(res < 0) {
+    *count_out = 0;
+    return IO_FAILURE;
+  }
+  *count_out = (unsigned) res;
+  return IO_SUCCESS;
+}
+
+int ssl_connection_flush(struct SSLConnection *connection) {
+  if(connection) {
+    if(ssl_handshake(connection)) {
+      return ssl_handshake_outgoing(connection);
+    }
+  } else {
+    struct SSLPendingConections *curr, *last = NULL, *next;
+    for(curr = firstPendingConection; curr; curr = next) {
+      next = curr->next;
+      if(!ssl_connection_flush(curr->connection)) {
+        // connection is already in auth process here, curr is freed!
+        continue;
+      }
+      last = curr;
+    }
+  }
+  return 0;
+}
+
+const char* ssl_get_cipher(struct SSLConnection *connection) {
+  if(!connection)
+    return NULL;
+  static char buf[401];
+  const char *kx_name, *cipher_name, *mac_name;
+  unsigned int len, i;
+  char *dest;
+
+  kx_name = gnutls_kx_get_name(gnutls_kx_get(connection->session));
+  cipher_name = gnutls_cipher_get_name(gnutls_cipher_get(connection->session));
+  mac_name = gnutls_mac_get_name(gnutls_mac_get(connection->session));
+
+  if(!kx_name || !cipher_name || !mac_name) {
+    return "<invalid>";
+  }
+
+  len = strlen(kx_name) + strlen(cipher_name) + strlen(mac_name);
+  if(len > 395) {
+    return "<invalid>";
+  }
+  else {
+    dest = buf;
+    i = 0;
+    while((*dest++ = kx_name[i++])) /* empty */ ;
+    *(dest - 1) = '-';
+    i = 0;
+    while((*dest++ = cipher_name[i++])) /* empty */ ;
+    *(dest - 1) = '-';
+    i = 0;
+    while((*dest++ = mac_name[i++])) /* empty */ ;
+    return buf;
+  }
+}