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->auth = SSL_VERIFY_NONE;
  99         ctx->server = server;
 100 #ifdef USE_VERSION_1_3
 101         pk_init(&ctx->key);
 102 #else
 103         rsa_init(&ctx->key, RSA_PKCS_V15, 0);
 104 #endif
 105
 106         return ctx;
 107 }
 108
 109 __hidden int __ustream_ssl_set_crt_file(struct ustream_ssl_ctx *ctx, const char *file)
 110 {
 111         int ret;
 112
 113 #ifdef USE_VERSION_1_3
 114         ret = x509_crt_parse_file(&ctx->cert, file);
 115 #else
 116         ret = x509parse_crtfile(&ctx->cert, file);
 117 #endif
 118         if (ret)
 119                 return -1;
 120
 121         if (!ctx->server)
 122                 ctx->auth = SSL_VERIFY_OPTIONAL;
 123
 124         return 0;
 125 }
 126
 127 __hidden int __ustream_ssl_set_key_file(struct ustream_ssl_ctx *ctx, const char *file)
 128 {
 129         int ret;
 130
 131 #ifdef USE_VERSION_1_3
 132         ret = pk_parse_keyfile(&ctx->key, file, NULL);
 133 #else
 134         ret = x509parse_keyfile(&ctx->key, file, NULL);
 135 #endif
 136         if (ret)
 137                 return -1;
 138
 139         return 0;
 140 }
 141
 142 __hidden void __ustream_ssl_context_free(struct ustream_ssl_ctx *ctx)
 143 {
 144 #ifdef USE_VERSION_1_3
 145         pk_free(&ctx->key);
 146         x509_crt_free(&ctx->cert);
 147 #else
 148         rsa_free(&ctx->key);
 149         x509_free(&ctx->cert);
 150 #endif
 151         free(ctx);
 152 }
 153
 154 static void ustream_ssl_error(struct ustream_ssl *us, int ret)
 155 {
 156         us->error = ret;
 157         uloop_timeout_set(&us->error_timer, 0);
 158 }
 159
 160 static bool ssl_do_wait(int ret)
 161 {
 162         switch(ret) {
 163         case POLARSSL_ERR_NET_WANT_READ:
 164         case POLARSSL_ERR_NET_WANT_WRITE:
 165                 return true;
 166         default:
 167                 return false;
 168         }
 169 }
 170
 171 __hidden enum ssl_conn_status __ustream_ssl_connect(struct ustream_ssl *us)
 172 {
 173         void *ssl = us->ssl;
 174         int r;
 175
 176         r = ssl_handshake(ssl);
 177         if (r == 0)
 178                 return U_SSL_OK;
 179
 180         if (ssl_do_wait(r))
 181                 return U_SSL_PENDING;
 182
 183         ustream_ssl_error(us, r);
 184         return U_SSL_ERROR;
 185 }
 186
 187 __hidden int __ustream_ssl_write(struct ustream_ssl *us, const char *buf, int len)
 188 {
 189         void *ssl = us->ssl;
 190         int ret = ssl_write(ssl, (const unsigned char *) buf, len);
 191
 192         if (ret < 0) {
 193                 if (ssl_do_wait(ret))
 194                         return 0;
 195
 196                 ustream_ssl_error(us, ret);
 197                 return -1;
 198         }
 199
 200         return ret;
 201 }
 202
 203 __hidden int __ustream_ssl_read(struct ustream_ssl *us, char *buf, int len)
 204 {
 205         int ret = ssl_read(us->ssl, (unsigned char *) buf, len);
 206
 207         if (ret < 0) {
 208                 if (ssl_do_wait(ret))
 209                         return U_SSL_PENDING;
 210
 211                 ustream_ssl_error(us, ret);
 212                 return U_SSL_ERROR;
 213         }
 214
 215         return ret;
 216 }
 217
 218 static const int default_ciphersuites[] =
 219 {
 220 #if defined(POLARSSL_AES_C)
 221 #if defined(POLARSSL_SHA2_C)
 222     TLS_RSA_WITH_AES_256_CBC_SHA256,
 223 #endif /* POLARSSL_SHA2_C */
 224 #if defined(POLARSSL_GCM_C) && defined(POLARSSL_SHA4_C)
 225     TLS_RSA_WITH_AES_256_GCM_SHA384,
 226 #endif /* POLARSSL_SHA2_C */
 227     TLS_RSA_WITH_AES_256_CBC_SHA,
 228 #endif
 229 #if defined(POLARSSL_CAMELLIA_C)
 230 #if defined(POLARSSL_SHA2_C)
 231     TLS_RSA_WITH_CAMELLIA_256_CBC_SHA256,
 232 #endif /* POLARSSL_SHA2_C */
 233     TLS_RSA_WITH_CAMELLIA_256_CBC_SHA,
 234 #endif
 235 #if defined(POLARSSL_AES_C)
 236 #if defined(POLARSSL_SHA2_C)
 237     TLS_RSA_WITH_AES_128_CBC_SHA256,
 238 #endif /* POLARSSL_SHA2_C */
 239 #if defined(POLARSSL_GCM_C) && defined(POLARSSL_SHA2_C)
 240     TLS_RSA_WITH_AES_128_GCM_SHA256,
 241 #endif /* POLARSSL_SHA2_C */
 242     TLS_RSA_WITH_AES_128_CBC_SHA,
 243 #endif
 244 #if defined(POLARSSL_CAMELLIA_C)
 245 #if defined(POLARSSL_SHA2_C)
 246     TLS_RSA_WITH_CAMELLIA_128_CBC_SHA256,
 247 #endif /* POLARSSL_SHA2_C */
 248     TLS_RSA_WITH_CAMELLIA_128_CBC_SHA,
 249 #endif
 250 #if defined(POLARSSL_DES_C)
 251     TLS_RSA_WITH_3DES_EDE_CBC_SHA,
 252 #endif
 253 #if defined(POLARSSL_ARC4_C)
 254     TLS_RSA_WITH_RC4_128_SHA,
 255     TLS_RSA_WITH_RC4_128_MD5,
 256 #endif
 257     0
 258 };
 259
 260 __hidden void *__ustream_ssl_session_new(struct ustream_ssl_ctx *ctx)
 261 {
 262         ssl_context *ssl;
 263         int ep;
 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 (ctx->server)
 275                 ep = SSL_IS_SERVER;
 276         else
 277                 ep = SSL_IS_CLIENT;
 278
 279         ssl_set_ciphersuites(ssl, default_ciphersuites);
 280         ssl_set_endpoint(ssl, ep);
 281         ssl_set_authmode(ssl, ctx->auth);
 282         ssl_set_rng(ssl, _urandom, NULL);
 283
 284         if (ctx->server) {
 285                 if (ctx->cert.next)
 286                         ssl_set_ca_chain(ssl, ctx->cert.next, NULL, NULL);
 287                 ssl_set_own_cert(ssl, &ctx->cert, &ctx->key);
 288         }
 289
 290         ssl_session_reset(ssl);
 291
 292         return ssl;
 293 }
 294
 295 __hidden void __ustream_ssl_session_free(void *ssl)
 296 {
 297         ssl_free(ssl);
 298         free(ssl);
 299 }