http.c: prompt for SSL client certificate password

If an SSL client certificate is enabled (via http.sslcert or
GIT_SSL_CERT), prompt for the certificate password rather than
defaulting to OpenSSL's password prompt.  This causes the prompt to only
appear once each run.  Previously, OpenSSL prompted the user *many*
times, causing git to be unusable over HTTPS with client-side
certificates.

Note that the password is stored in memory in the clear while the
program is running.  This may be a security problem if git crashes and
core dumps.

The user is always prompted, even if the certificate is not encrypted.
This should be fine; unencrypted certificates are rare and a security
risk anyway.

Signed-off-by: Mark Lodato <lodatom@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/http.c b/http.c
index 2e3d6493ef40e1b34fea8d166d760f0b1fcccafc..1c138135d74ecef0ae6887a1951ce275c89502ca 100644 (file)
--- a/http.c
+++ b/http.c
@@ -27,6 +27,17 @@ static int curl_ftp_no_epsv;
 static const char *curl_http_proxy;
 static char *user_name, *user_pass;
 
+#if LIBCURL_VERSION_NUM >= 0x071700
+/* Use CURLOPT_KEYPASSWD as is */
+#elif LIBCURL_VERSION_NUM >= 0x070903
+#define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
+#else
+#define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
+#endif
+
+static char *ssl_cert_password;
+static int ssl_cert_password_required;
+
 static struct curl_slist *pragma_header;
 
 static struct active_request_slot *active_queue_head;
@@ -167,6 +178,22 @@ static void init_curl_http_auth(CURL *result)
        }
 }
 
+static int has_cert_password(void)
+{
+       if (ssl_cert_password != NULL)
+               return 1;
+       if (ssl_cert == NULL || ssl_cert_password_required != 1)
+               return 0;
+       /* Only prompt the user once. */
+       ssl_cert_password_required = -1;
+       ssl_cert_password = getpass("Certificate Password: ");
+       if (ssl_cert_password != NULL) {
+               ssl_cert_password = xstrdup(ssl_cert_password);
+               return 1;
+       } else
+               return 0;
+}
+
 static CURL *get_curl_handle(void)
 {
        CURL *result = curl_easy_init();
@@ -189,6 +216,8 @@ static CURL *get_curl_handle(void)
 
        if (ssl_cert != NULL)
                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
+       if (has_cert_password())
+               curl_easy_setopt(result, CURLOPT_KEYPASSWD, ssl_cert_password);
 #if LIBCURL_VERSION_NUM >= 0x070902
        if (ssl_key != NULL)
                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
@@ -329,8 +358,11 @@ void http_init(struct remote *remote)
        if (getenv("GIT_CURL_FTP_NO_EPSV"))
                curl_ftp_no_epsv = 1;
 
-       if (remote && remote->url && remote->url[0])
+       if (remote && remote->url && remote->url[0]) {
                http_auth_init(remote->url[0]);
+               if (!prefixcmp(remote->url[0], "https://"))
+                       ssl_cert_password_required = 1;
+       }
 
 #ifndef NO_CURL_EASY_DUPHANDLE
        curl_default = get_curl_handle();
@@ -370,6 +402,13 @@ void http_cleanup(void)
                free((void *)curl_http_proxy);
                curl_http_proxy = NULL;
        }
+
+       if (ssl_cert_password != NULL) {
+               memset(ssl_cert_password, 0, strlen(ssl_cert_password));
+               free(ssl_cert_password);
+               ssl_cert_password = NULL;
+       }
+       ssl_cert_password_required = 0;
 }
 
 struct active_request_slot *get_active_slot(void)