ustream-ssl.c

   1 /*
   2  * ustream-ssl - library for SSL over ustream
   3  *
   4  * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
   5  *
   6  * Permission to use, copy, modify, and/or distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18
  19 #include <errno.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <libubox/ustream.h>
  23
  24 #include "ustream-ssl.h"
  25 #include "ustream-internal.h"
  26
  27 static void ustream_ssl_error_cb(struct uloop_timeout *t)
  28 {
  29         struct ustream_ssl *us = container_of(t, struct ustream_ssl, error_timer);
  30         static char buffer[128];
  31         int error = us->error;
  32
  33         if (us->notify_error)
  34                 us->notify_error(us, error, __ustream_ssl_strerror(us->error, buffer, sizeof(buffer)));
  35 }
  36
  37 static void ustream_ssl_check_conn(struct ustream_ssl *us)
  38 {
  39         if (us->connected || us->error)
  40                 return;
  41
  42         if (__ustream_ssl_connect(us) == U_SSL_OK) {
  43                 us->connected = true;
  44                 if (us->notify_connected)
  45                         us->notify_connected(us);
  46                 ustream_write_pending(&us->stream);
  47         }
  48 }
  49
  50 static bool __ustream_ssl_poll(struct ustream *s)
  51 {
  52         struct ustream_ssl *us = container_of(s->next, struct ustream_ssl, stream);
  53         char *buf;
  54         int len, ret;
  55         bool more = false;
  56
  57         ustream_ssl_check_conn(us);
  58         if (!us->connected || us->error)
  59                 return false;
  60
  61         do {
  62                 buf = ustream_reserve(&us->stream, 1, &len);
  63                 if (!len)
  64                         break;
  65
  66                 ret = __ustream_ssl_read(us, buf, len);
  67                 switch (ret) {
  68                 case U_SSL_PENDING:
  69                         return more;
  70                 case U_SSL_ERROR:
  71                         return false;
  72                 case 0:
  73                         us->stream.eof = true;
  74                         ustream_state_change(&us->stream);
  75                         return false;
  76                 default:
  77                         ustream_fill_read(&us->stream, ret);
  78                         more = true;
  79                         continue;
  80                 }
  81         } while (1);
  82
  83         return more;
  84 }
  85
  86 static void ustream_ssl_notify_read(struct ustream *s, int bytes)
  87 {
  88         __ustream_ssl_poll(s);
  89 }
  90
  91 static void ustream_ssl_notify_write(struct ustream *s, int bytes)
  92 {
  93         struct ustream_ssl *us = container_of(s->next, struct ustream_ssl, stream);
  94
  95         ustream_ssl_check_conn(us);
  96         ustream_write_pending(s->next);
  97 }
  98
  99 static void ustream_ssl_notify_state(struct ustream *s)
 100 {
 101         s->next->write_error = true;
 102         ustream_state_change(s->next);
 103 }
 104
 105 static int ustream_ssl_write(struct ustream *s, const char *buf, int len, bool more)
 106 {
 107         struct ustream_ssl *us = container_of(s, struct ustream_ssl, stream);
 108
 109         if (!us->connected || us->error)
 110                 return 0;
 111
 112         if (us->conn->w.data_bytes)
 113                 return 0;
 114
 115         return __ustream_ssl_write(us, buf, len);
 116 }
 117
 118 static void ustream_ssl_set_read_blocked(struct ustream *s)
 119 {
 120         struct ustream_ssl *us = container_of(s, struct ustream_ssl, stream);
 121
 122         ustream_set_read_blocked(us->conn, !!s->read_blocked);
 123 }
 124
 125 static void ustream_ssl_free(struct ustream *s)
 126 {
 127         struct ustream_ssl *us = container_of(s, struct ustream_ssl, stream);
 128
 129         if (us->conn) {
 130                 us->conn->next = NULL;
 131                 us->conn->notify_read = NULL;
 132                 us->conn->notify_write = NULL;
 133                 us->conn->notify_state = NULL;
 134         }
 135
 136         uloop_timeout_cancel(&us->error_timer);
 137         __ustream_ssl_session_free(us->ssl);
 138         free(us->peer_cn);
 139
 140         us->ctx = NULL;
 141         us->ssl = NULL;
 142         us->conn = NULL;
 143         us->peer_cn = NULL;
 144         us->connected = false;
 145         us->error = false;
 146         us->valid_cert = false;
 147         us->valid_cn = false;
 148 }
 149
 150 static bool ustream_ssl_poll(struct ustream *s)
 151 {
 152         struct ustream_ssl *us = container_of(s, struct ustream_ssl, stream);
 153         bool fd_poll;
 154
 155         fd_poll = ustream_poll(us->conn);
 156         return __ustream_ssl_poll(us->conn) || fd_poll;
 157 }
 158
 159 static void ustream_ssl_stream_init(struct ustream_ssl *us)
 160 {
 161         struct ustream *conn = us->conn;
 162         struct ustream *s = &us->stream;
 163
 164         conn->notify_read = ustream_ssl_notify_read;
 165         conn->notify_write = ustream_ssl_notify_write;
 166         conn->notify_state = ustream_ssl_notify_state;
 167
 168         s->free = ustream_ssl_free;
 169         s->write = ustream_ssl_write;
 170         s->poll = ustream_ssl_poll;
 171         s->set_read_blocked = ustream_ssl_set_read_blocked;
 172         ustream_init_defaults(s);
 173 }
 174
 175 static int _ustream_ssl_init(struct ustream_ssl *us, struct ustream *conn, struct ustream_ssl_ctx *ctx, bool server)
 176 {
 177         us->error_timer.cb = ustream_ssl_error_cb;
 178         us->server = server;
 179         us->conn = conn;
 180         us->ctx = ctx;
 181
 182 #if defined(HAVE_WOLFSSL) && defined(NO_WOLFSSL_SSLSETIO_SEND_RECV)
 183         ustream_set_io(ctx, NULL, conn);
 184 #endif
 185         us->ssl = __ustream_ssl_session_new(us->ctx);
 186         if (!us->ssl)
 187                 return -ENOMEM;
 188
 189         conn->next = &us->stream;
 190         ustream_set_io(ctx, us->ssl, conn);
 191         ustream_ssl_stream_init(us);
 192
 193         if (us->server_name)
 194                 __ustream_ssl_set_server_name(us);
 195
 196         ustream_ssl_check_conn(us);
 197
 198         return 0;
 199 }
 200
 201 static int _ustream_ssl_set_peer_cn(struct ustream_ssl *us, const char *name)
 202 {
 203         us->peer_cn = strdup(name);
 204         __ustream_ssl_update_peer_cn(us);
 205
 206         return 0;
 207 }
 208
 209 const struct ustream_ssl_ops ustream_ssl_ops = {
 210         .context_new = __ustream_ssl_context_new,
 211         .context_set_crt_file = __ustream_ssl_set_crt_file,
 212         .context_set_key_file = __ustream_ssl_set_key_file,
 213         .context_add_ca_crt_file = __ustream_ssl_add_ca_crt_file,
 214         .context_free = __ustream_ssl_context_free,
 215         .init = _ustream_ssl_init,
 216         .set_peer_cn = _ustream_ssl_set_peer_cn,
 217 };