push: add a config option push.gpgSign for default signed pushes

diff --git a/send-pack.c b/send-pack.c
index 189bdde0c29b1aa62c9628786fa7b8c1b4083fb3..f5bc098b390cbb716dc3d5a98230bc97308fa904 100644 (file)
--- a/send-pack.c
+++ b/send-pack.c
@@ -12,6 +12,29 @@
 #include "version.h"
 #include "sha1-array.h"
 #include "gpg-interface.h"
+#include "cache.h"
+
+int option_parse_push_signed(const struct option *opt,
+                            const char *arg, int unset)
+{
+       if (unset) {
+               *(int *)(opt->value) = SEND_PACK_PUSH_CERT_NEVER;
+               return 0;
+       }
+       switch (git_parse_maybe_bool(arg)) {
+       case 1:
+               *(int *)(opt->value) = SEND_PACK_PUSH_CERT_ALWAYS;
+               return 0;
+       case 0:
+               *(int *)(opt->value) = SEND_PACK_PUSH_CERT_NEVER;
+               return 0;
+       }
+       if (!strcasecmp("if-asked", arg)) {
+               *(int *)(opt->value) = SEND_PACK_PUSH_CERT_IF_ASKED;
+               return 0;
+       }
+       die("bad %s argument: %s", opt->long_name, arg);
+}
 
 static int feed_object(const unsigned char *sha1, int fd, int negative)
 {
@@ -308,6 +331,28 @@ static int atomic_push_failure(struct send_pack_args *args,
                     failing_ref->name, failing_ref->status);
 }
 
+#define NONCE_LEN_LIMIT 256
+
+static void reject_invalid_nonce(const char *nonce, int len)
+{
+       int i = 0;
+
+       if (NONCE_LEN_LIMIT <= len)
+               die("the receiving end asked to sign an invalid nonce <%.*s>",
+                   len, nonce);
+
+       for (i = 0; i < len; i++) {
+               int ch = nonce[i] & 0xFF;
+               if (isalnum(ch) ||
+                   ch == '-' || ch == '.' ||
+                   ch == '/' || ch == '+' ||
+                   ch == '=' || ch == '_')
+                       continue;
+               die("the receiving end asked to sign an invalid nonce <%.*s>",
+                   len, nonce);
+       }
+}
+
 int send_pack(struct send_pack_args *args,
              int fd[], struct child_process *conn,
              struct ref *remote_refs,
@@ -348,13 +393,20 @@ int send_pack(struct send_pack_args *args,
                args->use_thin_pack = 0;
        if (server_supports("atomic"))
                atomic_supported = 1;
-       if (args->push_cert) {
-               int len;
 
+       if (args->push_cert != SEND_PACK_PUSH_CERT_NEVER) {
+               int len;
                push_cert_nonce = server_feature_value("push-cert", &len);
-               if (!push_cert_nonce)
+               if (push_cert_nonce) {
+                       reject_invalid_nonce(push_cert_nonce, len);
+                       push_cert_nonce = xmemdupz(push_cert_nonce, len);
+               } else if (args->push_cert == SEND_PACK_PUSH_CERT_ALWAYS) {
                        die(_("the receiving end does not support --signed push"));
-               push_cert_nonce = xmemdupz(push_cert_nonce, len);
+               } else if (args->push_cert == SEND_PACK_PUSH_CERT_IF_ASKED) {
+                       warning(_("not sending a push certificate since the"
+                                 " receiving end does not support --signed"
+                                 " push"));
+               }
        }
 
        if (!remote_refs) {
@@ -390,7 +442,7 @@ int send_pack(struct send_pack_args *args,
        if (!args->dry_run)
                advertise_shallow_grafts_buf(&req_buf);
 
-       if (!args->dry_run && args->push_cert)
+       if (!args->dry_run && push_cert_nonce)
                cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
                                               cap_buf.buf, push_cert_nonce);
 
@@ -429,7 +481,7 @@ int send_pack(struct send_pack_args *args,
        for (ref = remote_refs; ref; ref = ref->next) {
                char *old_hex, *new_hex;
 
-               if (args->dry_run || args->push_cert)
+               if (args->dry_run || push_cert_nonce)
                        continue;
 
                if (check_to_send_update(ref, args) < 0)