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(struct ustream_ssl_ctx *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 struct ustream_ssl_ctx *
  87 __ustream_ssl_context_new(bool server)
  88 {
  89         struct ustream_ssl_ctx *ctx;
  90
  91         if (!urandom_init())
  92                 return NULL;
  93
  94         ctx = calloc(1, sizeof(*ctx));
  95         if (!ctx)
  96                 return NULL;
  97
  98         ctx->server = server;
  99 #ifdef USE_VERSION_1_3
 100         pk_init(&ctx->key);
 101 #else
 102         rsa_init(&ctx->key, RSA_PKCS_V15, 0);
 103 #endif
 104
 105         return ctx;
 106 }
 107
 108 __hidden int __ustream_ssl_set_crt_file(struct ustream_ssl_ctx *ctx, const char *file)
 109 {
 110         int ret;
 111
 112 #ifdef USE_VERSION_1_3
 113         ret = x509_crt_parse_file(&ctx->cert, file);
 114 #else
 115         ret = x509parse_crtfile(&ctx->cert, file);
 116 #endif
 117         if (ret)
 118                 return -1;
 119
 120         return 0;
 121 }
 122
 123 __hidden int __ustream_ssl_set_key_file(struct ustream_ssl_ctx *ctx, const char *file)
 124 {
 125         int ret;
 126
 127 #ifdef USE_VERSION_1_3
 128         ret = pk_parse_keyfile(&ctx->key, file, NULL);
 129 #else
 130         ret = x509parse_keyfile(&ctx->key, file, NULL);
 131 #endif
 132         if (ret)
 133                 return -1;
 134
 135         return 0;
 136 }
 137
 138 __hidden void __ustream_ssl_context_free(struct ustream_ssl_ctx *ctx)
 139 {
 140 #ifdef USE_VERSION_1_3
 141         pk_free(&ctx->key);
 142         x509_crt_free(&ctx->cert);
 143 #else
 144         rsa_free(&ctx->key);
 145         x509_free(&ctx->cert);
 146 #endif
 147         free(ctx);
 148 }
 149
 150 static void ustream_ssl_error(struct ustream_ssl *us, int ret)
 151 {
 152         us->error = ret;
 153         uloop_timeout_set(&us->error_timer, 0);
 154 }
 155
 156 static bool ssl_do_wait(int ret)
 157 {
 158         switch(ret) {
 159         case POLARSSL_ERR_NET_WANT_READ:
 160         case POLARSSL_ERR_NET_WANT_WRITE:
 161                 return true;
 162         default:
 163                 return false;
 164         }
 165 }
 166
 167 __hidden enum ssl_conn_status __ustream_ssl_connect(struct ustream_ssl *us)
 168 {
 169         void *ssl = us->ssl;
 170         int r;
 171
 172         r = ssl_handshake(ssl);
 173         if (r == 0)
 174                 return U_SSL_OK;
 175
 176         if (ssl_do_wait(r))
 177                 return U_SSL_PENDING;
 178
 179         ustream_ssl_error(us, r);
 180         return U_SSL_ERROR;
 181 }
 182
 183 __hidden int __ustream_ssl_write(struct ustream_ssl *us, const char *buf, int len)
 184 {
 185         void *ssl = us->ssl;
 186         int ret = ssl_write(ssl, (const unsigned char *) buf, len);
 187
 188         if (ret < 0) {
 189                 if (ssl_do_wait(ret))
 190                         return 0;
 191
 192                 ustream_ssl_error(us, ret);
 193                 return -1;
 194         }
 195
 196         return ret;
 197 }
 198
 199 __hidden int __ustream_ssl_read(struct ustream_ssl *us, char *buf, int len)
 200 {
 201         int ret = ssl_read(us->ssl, (unsigned char *) buf, len);
 202
 203         if (ret < 0) {
 204                 if (ssl_do_wait(ret))
 205                         return U_SSL_PENDING;
 206
 207                 ustream_ssl_error(us, ret);
 208                 return U_SSL_ERROR;
 209         }
 210
 211         return ret;
 212 }
 213
 214 static const int default_ciphersuites[] =
 215 {
 216 #if defined(POLARSSL_AES_C)
 217 #if defined(POLARSSL_SHA2_C)
 218     TLS_RSA_WITH_AES_256_CBC_SHA256,
 219 #endif /* POLARSSL_SHA2_C */
 220 #if defined(POLARSSL_GCM_C) && defined(POLARSSL_SHA4_C)
 221     TLS_RSA_WITH_AES_256_GCM_SHA384,
 222 #endif /* POLARSSL_SHA2_C */
 223     TLS_RSA_WITH_AES_256_CBC_SHA,
 224 #endif
 225 #if defined(POLARSSL_CAMELLIA_C)
 226 #if defined(POLARSSL_SHA2_C)
 227     TLS_RSA_WITH_CAMELLIA_256_CBC_SHA256,
 228 #endif /* POLARSSL_SHA2_C */
 229     TLS_RSA_WITH_CAMELLIA_256_CBC_SHA,
 230 #endif
 231 #if defined(POLARSSL_AES_C)
 232 #if defined(POLARSSL_SHA2_C)
 233     TLS_RSA_WITH_AES_128_CBC_SHA256,
 234 #endif /* POLARSSL_SHA2_C */
 235 #if defined(POLARSSL_GCM_C) && defined(POLARSSL_SHA2_C)
 236     TLS_RSA_WITH_AES_128_GCM_SHA256,
 237 #endif /* POLARSSL_SHA2_C */
 238     TLS_RSA_WITH_AES_128_CBC_SHA,
 239 #endif
 240 #if defined(POLARSSL_CAMELLIA_C)
 241 #if defined(POLARSSL_SHA2_C)
 242     TLS_RSA_WITH_CAMELLIA_128_CBC_SHA256,
 243 #endif /* POLARSSL_SHA2_C */
 244     TLS_RSA_WITH_CAMELLIA_128_CBC_SHA,
 245 #endif
 246 #if defined(POLARSSL_DES_C)
 247     TLS_RSA_WITH_3DES_EDE_CBC_SHA,
 248 #endif
 249 #if defined(POLARSSL_ARC4_C)
 250     TLS_RSA_WITH_RC4_128_SHA,
 251     TLS_RSA_WITH_RC4_128_MD5,
 252 #endif
 253     0
 254 };
 255
 256 __hidden void *__ustream_ssl_session_new(struct ustream_ssl_ctx *ctx)
 257 {
 258         ssl_context *ssl;
 259         int ep, auth;
 260
 261         ssl = calloc(1, sizeof(ssl_context));
 262         if (!ssl)
 263                 return NULL;
 264
 265         if (ssl_init(ssl)) {
 266                 free(ssl);
 267                 return NULL;
 268         }
 269
 270         if (ctx->server) {
 271                 ep = SSL_IS_SERVER;
 272                 auth = SSL_VERIFY_NONE;
 273         } else {
 274                 ep = SSL_IS_CLIENT;
 275                 auth = SSL_VERIFY_OPTIONAL;
 276         }
 277
 278         ssl_set_ciphersuites(ssl, default_ciphersuites);
 279         ssl_set_endpoint(ssl, ep);
 280         ssl_set_authmode(ssl, auth);
 281         ssl_set_rng(ssl, _urandom, NULL);
 282
 283         if (ctx->server) {
 284                 if (ctx->cert.next)
 285                         ssl_set_ca_chain(ssl, ctx->cert.next, NULL, NULL);
 286                 ssl_set_own_cert(ssl, &ctx->cert, &ctx->key);
 287         }
 288
 289         ssl_session_reset(ssl);
 290
 291         return ssl;
 292 }
 293
 294 __hidden void __ustream_ssl_session_free(void *ssl)
 295 {
 296         ssl_free(ssl);
 297         free(ssl);
 298 }