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HTTPS: restrict ciphersuites

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This commit is contained in:
John-Mark Bell 2018-04-22 12:54:23 +00:00
parent 7d4349035d
commit a8bf9b05aa
1 changed files with 18 additions and 0 deletions
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18
content/fetchers/curl.c
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@ -67,6 +67,21 @@
/** maximum number of X509 certificates in chain for TLS connection */
#define MAX_CERTS 10
/* the ciphersuites we are willing to use */
#define CIPHER_LIST \
/* disable everything */ \
"-ALL:" \
/* enable TLSv1.2 PFS suites */ \
"EECDH+AES+TLSv1.2:EDH+AES+TLSv1.2:" \
/* enable PFS AES GCM suites */ \
"EECDH+AESGCM:EDH+AESGCM:" \
/* Enable PFS AES CBC suites */ \
"EECDH+AES:EDH+AES:" \
/* Enable non-PFS fallback suite */ \
"AES128-SHA:" \
/* Remove any PFS suites using weak DSA key exchange */ \
"-DSS"
/** SSL certificate info */
struct cert_info {
X509 *cert; /**< Pointer to certificate */
@ -555,6 +570,8 @@ fetch_curl_sslctxfun(CURL *curl_handle, void *_sslctx, void *parm)
/* Ensure server rejects the connection if downgraded too far */
SSL_CTX_set_mode(sslctx, SSL_MODE_SEND_FALLBACK_SCSV);
#endif
/* Disable TLS1.2 ciphersuites */
SSL_CTX_set_cipher_list(sslctx, CIPHER_LIST ":-TLSv1.2");
}
SSL_CTX_set_options(sslctx, options);
@ -1512,6 +1529,7 @@ nserror fetch_curl_register(void)
SETOPT(CURLOPT_LOW_SPEED_TIME, 180L);
SETOPT(CURLOPT_NOSIGNAL, 1L);
SETOPT(CURLOPT_CONNECTTIMEOUT, nsoption_uint(curl_fetch_timeout));
SETOPT(CURLOPT_SSL_CIPHER_LIST, CIPHER_LIST);
if (nsoption_charp(ca_bundle) &&
strcmp(nsoption_charp(ca_bundle), "")) {