ustream-polarssl.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 <sys/types.h>
  20 #include <fcntl.h>
  21 #include <unistd.h>
  22 #include <stdlib.h>
  23
  24 #include "ustream-ssl.h"
  25 #include "ustream-internal.h"
  26
  27 static int urandom_fd = -1;
  28
  29 static int s_ustream_read(void *ctx, unsigned char *buf, size_t len)
  30 {
  31         struct ustream *s = ctx;
  32         char *sbuf;
  33         int slen;
  34
  35         if (s->eof)
  36                 return 0;
  37
  38         sbuf = ustream_get_read_buf(s, &slen);
  39         if (slen > len)
  40                 slen = len;
  41
  42         if (!slen)
  43                 return POLARSSL_ERR_NET_WANT_READ;
  44
  45         memcpy(buf, sbuf, slen);
  46         ustream_consume(s, slen);
  47
  48         return slen;
  49 }
  50
  51 static int s_ustream_write(void *ctx, const unsigned char *buf, size_t len)
  52 {
  53         struct ustream *s = ctx;
  54         int ret;
  55
  56         ret = ustream_write(s, (const char *) buf, len, false);
  57         if (ret < 0 || s->write_error)
  58                 return POLARSSL_ERR_NET_SEND_FAILED;
  59
  60         return ret;
  61 }
  62
  63 __hidden void ustream_set_io(void *ctx, void *ssl, struct ustream *conn)
  64 {
  65         ssl_set_bio(ssl, s_ustream_read, conn, s_ustream_write, conn);
  66 }
  67
  68 static bool urandom_init(void)
  69 {
  70         if (urandom_fd > -1)
  71                 return true;
  72
  73         urandom_fd = open("/dev/urandom", O_RDONLY);
  74         if (urandom_fd < 0)
  75                 return false;
  76
  77         return true;
  78 }
  79
  80 static int _urandom(void *ctx, unsigned char *out, size_t len)
  81 {
  82         read(urandom_fd, out, len);
  83         return 0;
  84 }
  85
  86 __hidden void * __ustream_ssl_context_new(bool server)
  87 {
  88         struct ustream_polarssl_ctx *uctx;
  89
  90         if (!urandom_init())
  91                 return NULL;
  92
  93         uctx = calloc(1, sizeof(*uctx));
  94         if (!uctx)
  95                 return NULL;
  96
  97         uctx->server = server;
  98 #ifdef USE_VERSION_1_3
  99         pk_init(&uctx->key);
 100 #else
 101         rsa_init(&uctx->key, RSA_PKCS_V15, 0);
 102 #endif
 103
 104         return uctx;
 105 }
 106
 107 __hidden int __ustream_ssl_set_crt_file(void *ctx, const char *file)
 108 {
 109         struct ustream_polarssl_ctx *uctx = ctx;
 110         int ret;
 111
 112 #ifdef USE_VERSION_1_3
 113         ret = x509_crt_parse_file(&uctx->cert, file);
 114 #else
 115         ret = x509parse_crtfile(&uctx->cert, file);
 116 #endif
 117         if (ret)
 118                 return -1;
 119
 120         return 0;
 121 }
 122
 123 __hidden int __ustream_ssl_set_key_file(void *ctx, const char *file)
 124 {
 125         struct ustream_polarssl_ctx *uctx = ctx;
 126         int ret;
 127
 128 #ifdef USE_VERSION_1_3
 129         ret = pk_parse_keyfile(&uctx->key, file, NULL);
 130 #else
 131         ret = x509parse_keyfile(&uctx->key, file, NULL);
 132 #endif
 133         if (ret)
 134                 return -1;
 135
 136         return 0;
 137 }
 138
 139 __hidden void __ustream_ssl_context_free(void *ctx)
 140 {
 141         struct ustream_polarssl_ctx *uctx = ctx;
 142
 143 #ifdef USE_VERSION_1_3
 144         pk_free(&uctx->key);
 145         x509_crt_free(&uctx->cert);
 146 #else
 147         rsa_free(&uctx->key);
 148         x509_free(&uctx->cert);
 149 #endif
 150         free(ctx);
 151 }
 152
 153 static void ustream_ssl_error(struct ustream_ssl *us, int ret)
 154 {
 155         us->error = ret;
 156         uloop_timeout_set(&us->error_timer, 0);
 157 }
 158
 159 static bool ssl_do_wait(int ret)
 160 {
 161         switch(ret) {
 162         case POLARSSL_ERR_NET_WANT_READ:
 163         case POLARSSL_ERR_NET_WANT_WRITE:
 164                 return true;
 165         default:
 166                 return false;
 167         }
 168 }
 169
 170 __hidden enum ssl_conn_status __ustream_ssl_connect(struct ustream_ssl *us)
 171 {
 172         void *ssl = us->ssl;
 173         int r;
 174
 175         r = ssl_handshake(ssl);
 176         if (r == 0)
 177                 return U_SSL_OK;
 178
 179         if (ssl_do_wait(r))
 180                 return U_SSL_PENDING;
 181
 182         ustream_ssl_error(us, r);
 183         return U_SSL_ERROR;
 184 }
 185
 186 __hidden int __ustream_ssl_write(struct ustream_ssl *us, const char *buf, int len)
 187 {
 188         void *ssl = us->ssl;
 189         int ret = ssl_write(ssl, (const unsigned char *) buf, len);
 190
 191         if (ret < 0) {
 192                 if (ssl_do_wait(ret))
 193                         return 0;
 194
 195                 ustream_ssl_error(us, ret);
 196                 return -1;
 197         }
 198
 199         return ret;
 200 }
 201
 202 __hidden int __ustream_ssl_read(struct ustream_ssl *us, char *buf, int len)
 203 {
 204         int ret = ssl_read(us->ssl, (unsigned char *) buf, len);
 205
 206         if (ret < 0) {
 207                 if (ssl_do_wait(ret))
 208                         return U_SSL_PENDING;
 209
 210                 ustream_ssl_error(us, ret);
 211                 return U_SSL_ERROR;
 212         }
 213
 214         return ret;
 215 }
 216
 217 static const int default_ciphersuites[] =
 218 {
 219 #if defined(POLARSSL_AES_C)
 220 #if defined(POLARSSL_SHA2_C)
 221     TLS_RSA_WITH_AES_256_CBC_SHA256,
 222 #endif /* POLARSSL_SHA2_C */
 223 #if defined(POLARSSL_GCM_C) && defined(POLARSSL_SHA4_C)
 224     TLS_RSA_WITH_AES_256_GCM_SHA384,
 225 #endif /* POLARSSL_SHA2_C */
 226     TLS_RSA_WITH_AES_256_CBC_SHA,
 227 #endif
 228 #if defined(POLARSSL_CAMELLIA_C)
 229 #if defined(POLARSSL_SHA2_C)
 230     TLS_RSA_WITH_CAMELLIA_256_CBC_SHA256,
 231 #endif /* POLARSSL_SHA2_C */
 232     TLS_RSA_WITH_CAMELLIA_256_CBC_SHA,
 233 #endif
 234 #if defined(POLARSSL_AES_C)
 235 #if defined(POLARSSL_SHA2_C)
 236     TLS_RSA_WITH_AES_128_CBC_SHA256,
 237 #endif /* POLARSSL_SHA2_C */
 238 #if defined(POLARSSL_GCM_C) && defined(POLARSSL_SHA2_C)
 239     TLS_RSA_WITH_AES_128_GCM_SHA256,
 240 #endif /* POLARSSL_SHA2_C */
 241     TLS_RSA_WITH_AES_128_CBC_SHA,
 242 #endif
 243 #if defined(POLARSSL_CAMELLIA_C)
 244 #if defined(POLARSSL_SHA2_C)
 245     TLS_RSA_WITH_CAMELLIA_128_CBC_SHA256,
 246 #endif /* POLARSSL_SHA2_C */
 247     TLS_RSA_WITH_CAMELLIA_128_CBC_SHA,
 248 #endif
 249 #if defined(POLARSSL_DES_C)
 250     TLS_RSA_WITH_3DES_EDE_CBC_SHA,
 251 #endif
 252 #if defined(POLARSSL_ARC4_C)
 253     TLS_RSA_WITH_RC4_128_SHA,
 254     TLS_RSA_WITH_RC4_128_MD5,
 255 #endif
 256     0
 257 };
 258
 259 __hidden void *__ustream_ssl_session_new(void *ctx)
 260 {
 261         struct ustream_polarssl_ctx *uctx = ctx;
 262         ssl_context *ssl;
 263         int ep, auth;
 264
 265         ssl = calloc(1, sizeof(ssl_context));
 266         if (!ssl)
 267                 return NULL;
 268
 269         if (ssl_init(ssl)) {
 270                 free(ssl);
 271                 return NULL;
 272         }
 273
 274         if (uctx->server) {
 275                 ep = SSL_IS_SERVER;
 276                 auth = SSL_VERIFY_NONE;
 277         } else {
 278                 ep = SSL_IS_CLIENT;
 279                 auth = SSL_VERIFY_OPTIONAL;
 280         }
 281
 282         ssl_set_ciphersuites(ssl, default_ciphersuites);
 283         ssl_set_endpoint(ssl, ep);
 284         ssl_set_authmode(ssl, auth);
 285         ssl_set_rng(ssl, _urandom, NULL);
 286
 287         if (uctx->server) {
 288                 if (uctx->cert.next)
 289                         ssl_set_ca_chain(ssl, uctx->cert.next, NULL, NULL);
 290                 ssl_set_own_cert(ssl, &uctx->cert, &uctx->key);
 291         }
 292
 293         ssl_session_reset(ssl);
 294
 295         return ssl;
 296 }
 297
 298 __hidden void __ustream_ssl_session_free(void *ssl)
 299 {
 300         ssl_free(ssl);
 301         free(ssl);
 302 }