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[openssl] Add support for defining ALPN protocols

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This commit is contained in:
Kedar Sovani
2017-09-26 14:13:37 +05:30
parent 7c9b24b407
commit 3420baa01b
3 changed files with 57 additions and 3 deletions
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39
components/openssl/library/ssl_lib.c
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@@ -224,6 +224,10 @@ void SSL_CTX_free(SSL_CTX* ctx)
X509_free(ctx->client_CA);
if (ctx->ssl_alpn.alpn_string) {
ssl_mem_free((void *)ctx->ssl_alpn.alpn_string);
}
ssl_mem_free(ctx);
}
@@ -1554,3 +1558,38 @@ void SSL_set_verify(SSL *ssl, int mode, int (*verify_callback)(int, X509_STORE_C
ssl->verify_mode = mode;
ssl->verify_callback = verify_callback;
}
/**
* @brief set the ALPN protocols in the preferred order. SSL APIs require the
* protocols in a <length><value><length2><value2> format. mbedtls doesn't need
* that though. We sanitize that here itself. So convert from:
* "\x02h2\x06spdy/1" to { {"h2"}, {"spdy/1}, {NULL}}
*/
int SSL_CTX_set_alpn_protos(SSL_CTX *ctx, const unsigned char *protos, unsigned protos_len)
{
ctx->ssl_alpn.alpn_string = ssl_mem_zalloc(protos_len + 1);
if (! ctx->ssl_alpn.alpn_string) {
return 1;
}
ctx->ssl_alpn.alpn_status = ALPN_ENABLE;
memcpy(ctx->ssl_alpn.alpn_string, protos, protos_len);
char *ptr = ctx->ssl_alpn.alpn_string;
int i;
/* Only running to 1 less than the actual size */
for (i = 0; i < ALPN_LIST_MAX - 1; i++) {
char len = *ptr;
*ptr = '\0'; // Overwrite the length to act as previous element's string terminator
ptr++;
protos_len--;
ctx->ssl_alpn.alpn_list[i] = ptr;
ptr += len;
protos_len -= len;
if (! protos_len) {
i++;
break;
}
}
ctx->ssl_alpn.alpn_list[i] = NULL;
return 0;
}