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openssl: use OpenSSL's default ciphers by default

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Up2date versions of OpenSSL maintain the default reasonably secure
without breaking compatibility, so it is better not to override the
default by curl.  Suggested at https://bugzilla.redhat.com/1483972

Closes #1846
This commit is contained in:
Kamil Dudka 2017-08-30 14:12:10 +02:00
parent 25fc694a41
commit ea142a837e
1 changed files with 14 additions and 4 deletions
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10
lib/vtls/openssl.c
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@ -154,8 +154,16 @@ static unsigned long OpenSSL_version_num(void)
#define OSSL_PACKAGE "OpenSSL" #define OSSL_PACKAGE "OpenSSL"
#endif #endif
#if (OPENSSL_VERSION_NUMBER >= 0x10100000L)
/* up2date versions of OpenSSL maintain the default reasonably secure without
* breaking compatibility, so it is better not to override the default by curl
*/
#define DEFAULT_CIPHER_SELECTION NULL
#else
/* ... but it is not the case with old versions of OpenSSL */
#define DEFAULT_CIPHER_SELECTION \ #define DEFAULT_CIPHER_SELECTION \
"ALL:!EXPORT:!EXPORT40:!EXPORT56:!aNULL:!LOW:!RC4:@STRENGTH" "ALL:!EXPORT:!EXPORT40:!EXPORT56:!aNULL:!LOW:!RC4:@STRENGTH"
#endif
struct ssl_backend_data { struct ssl_backend_data {
/* these ones requires specific SSL-types */ /* these ones requires specific SSL-types */
@ -2116,11 +2124,13 @@ static CURLcode ossl_connect_step1(struct connectdata *conn, int sockindex)
ciphers = SSL_CONN_CONFIG(cipher_list); ciphers = SSL_CONN_CONFIG(cipher_list);
if(!ciphers) if(!ciphers)
ciphers = (char *)DEFAULT_CIPHER_SELECTION; ciphers = (char *)DEFAULT_CIPHER_SELECTION;
if(ciphers) {
if(!SSL_CTX_set_cipher_list(BACKEND->ctx, ciphers)) { if(!SSL_CTX_set_cipher_list(BACKEND->ctx, ciphers)) {
failf(data, "failed setting cipher list: %s", ciphers); failf(data, "failed setting cipher list: %s", ciphers);
return CURLE_SSL_CIPHER; return CURLE_SSL_CIPHER;
} }
infof(data, "Cipher selection: %s\n", ciphers); infof(data, "Cipher selection: %s\n", ciphers);
}
#ifdef USE_TLS_SRP #ifdef USE_TLS_SRP
if(ssl_authtype == CURL_TLSAUTH_SRP) { if(ssl_authtype == CURL_TLSAUTH_SRP) {