[PATCHv5] http: add support for specifying the SSL version

diff --git a/Documentation/config.txt b/Documentation/config.txt
index 315f271..b23b01a 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt

@@ -1595,6 +1595,28 @@ http.saveCookies::
        If set, store cookies received during requests to the file specified by
        http.cookieFile. Has no effect if http.cookieFile is unset.

+http.sslVersion::
+       The SSL version to use when negotiating an SSL connection, if you
+       want to force the default.  The available and default version depend on
+       whether libcurl was built against NSS or OpenSSL and the particular configuration
+       of the crypto library in use. Internally this sets the 'CURLOPT_SSL_VERSION'
+       option; see the libcurl documentation for more details on the format
+       of this option and for the ssl version supported. Actually the possible values
+       of this option are:
+
+       - sslv2
+       - sslv3
+       - tlsv1
+       - tlsv1.0
+       - tlsv1.1
+       - tlsv1.2
+
++
+Can be overridden by the 'GIT_SSL_VERSION' environment variable.
+To force git to use libcurl's default ssl version and ignore any
+explicit http.sslversion option, set 'GIT_SSL_VERSION' to the
+empty string.
+
 http.sslCipherList::
   A list of SSL ciphers to use when negotiating an SSL connection.
   The available ciphers depend on whether libcurl was built against

diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index c97c648..6e9359c 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash

@@ -2118,6 +2118,7 @@ _git_config ()
                http.postBuffer
                http.proxy
                http.sslCipherList
+               http.sslVersion
                http.sslCAInfo
                http.sslCAPath
                http.sslCert

diff --git a/http.c b/http.c
index e9c6fdd..4c5a2e0 100644
--- a/http.c
+++ b/http.c

@@ -37,6 +37,20 @@ static int curl_ssl_verify = -1;
 static int curl_ssl_try;
 static const char *ssl_cert;
 static const char *ssl_cipherlist;
+static const char *ssl_version;
+static struct {
+       const char *name;
+       long ssl_version;
+       } sslversions[] = {
+               { "sslv2", CURL_SSLVERSION_SSLv2 },
+               { "sslv3", CURL_SSLVERSION_TLSv1 },
+               { "tlsv1", CURL_SSLVERSION_TLSv1 },
+#if LIBCURL_VERSION_NUM >= 0x072200
+               { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
+               { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
+               { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 }
+#endif
+};
 #if LIBCURL_VERSION_NUM >= 0x070903
 static const char *ssl_key;
 #endif

@@ -190,6 +204,8 @@ static int http_options(const char *var, const char *value, void *cb)
        }
        if (!strcmp("http.sslcipherlist", var))
                return git_config_string(&ssl_cipherlist, var, value);
+       if (!strcmp("http.sslversion", var))
+               return git_config_string(&ssl_version, var, value);
        if (!strcmp("http.sslcert", var))
                return git_config_string(&ssl_cert, var, value);
 #if LIBCURL_VERSION_NUM >= 0x070903

@@ -364,9 +380,23 @@ static CURL *get_curl_handle(void)
        if (http_proactive_auth)
                init_curl_http_auth(result);

+       if (getenv("GIT_SSL_VERSION"))
+               ssl_version = getenv("GIT_SSL_VERSION");
+       if (ssl_version && *ssl_version) {
+               int i;
+               for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
+                       if (!strcmp(ssl_version, sslversions[i].name)) {
+                               curl_easy_setopt(result, CURLOPT_SSLVERSION,
+                                       sslversions[i].ssl_version);
+                               break;
+                       }
+               }
+               if (i == ARRAY_SIZE(sslversions))
+                       warning("unsupported ssl version %s: using default", ssl_version);
+       }
+
        if (getenv("GIT_SSL_CIPHER_LIST"))
                ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
-
        if (ssl_cipherlist != NULL && *ssl_cipherlist)
                curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
                                ssl_cipherlist);
--

2.5.0.235.gb9bd8dc