Support FTP-over-SSL/TLS for regular FTP

Add a boolean http.sslTry option which allows to enable AUTH SSL/TLS and
encrypted data transfers when connecting via regular FTP protocol.

Default is false since it might trigger certificate verification errors on
misconfigured servers.

Signed-off-by: Modestas Vainius <modestas@vainius.eu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/config.txt b/Documentation/config.txt
index bc750d579464a8c6c2e534e17ecae6d3a66287a9..f2ef441f2d1d76094757ce36bda8a377567eaf16 100644 (file)
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -1447,6 +1447,14 @@ http.sslCAPath::
        with when fetching or pushing over HTTPS. Can be overridden
        by the 'GIT_SSL_CAPATH' environment variable.
 
+http.sslTry::
+       Attempt to use AUTH SSL/TLS and encrypted data transfers
+       when connecting via regular FTP protocol. This might be needed
+       if the FTP server requires it for security reasons or you wish
+       to connect securely whenever remote FTP server supports it.
+       Default is false since it might trigger certificate verification
+       errors on misconfigured servers.
+
 http.maxRequests::
        How many HTTP requests to launch in parallel. Can be overridden
        by the 'GIT_HTTP_MAX_REQUESTS' environment variable. Default is 5.

diff --git a/http.c b/http.c
index d9d1aad3be468394e39966c0b45e7e101b387b0c..e3a274b5507af44d09b757c7b4b750b63e6bcf0e 100644 (file)
--- a/http.c
+++ b/http.c
@@ -30,6 +30,7 @@ static CURL *curl_default;
 char curl_errorstr[CURL_ERROR_SIZE];
 
 static int curl_ssl_verify = -1;
+static int curl_ssl_try;
 static const char *ssl_cert;
 #if LIBCURL_VERSION_NUM >= 0x070903
 static const char *ssl_key;
@@ -162,6 +163,10 @@ static int http_options(const char *var, const char *value, void *cb)
                        ssl_cert_password_required = 1;
                return 0;
        }
+       if (!strcmp("http.ssltry", var)) {
+               curl_ssl_try = git_config_bool(var, value);
+               return 0;
+       }
        if (!strcmp("http.minsessions", var)) {
                min_curl_sessions = git_config_int(var, value);
 #ifndef USE_CURL_MULTI
@@ -306,6 +311,11 @@ static CURL *get_curl_handle(void)
        if (curl_ftp_no_epsv)
                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 
+#ifdef CURLOPT_USE_SSL
+       if (curl_ssl_try)
+               curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
+#endif
+
        if (curl_http_proxy) {
                curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
                curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);

diff --git a/http.h b/http.h
index 25d19313983f0d0a11ab50dffbb623b105c8960a..097514dd6fea374d02b2d4e1cc8d41d8f61bf1b5 100644 (file)
--- a/http.h
+++ b/http.h
@@ -42,6 +42,15 @@
 #define NO_CURL_IOCTL
 #endif
 
+/*
+ * CURLOPT_USE_SSL was known as CURLOPT_FTP_SSL up to 7.16.4,
+ * and the constants were known as CURLFTPSSL_*
+*/
+#if !defined(CURLOPT_USE_SSL) && defined(CURLOPT_FTP_SSL)
+#define CURLOPT_USE_SSL CURLOPT_FTP_SSL
+#define CURLUSESSL_TRY CURLFTPSSL_TRY
+#endif
+
 struct slot_results {
        CURLcode curl_result;
        long http_code;