When the git-daemon is asked about an inaccessible
repository, it simply hangs up the connection without saying
anything further. This makes it hard to distinguish between
a repository we cannot access (e.g., due to typo), and a
service or network outage.
Instead, let's print an "ERR" line, which git clients
understand since v1.6.1 (2008-12-24).
Because there is a risk of leaking information about
non-exported repositories, by default all errors simply say
"access denied". Sites which don't have hidden repositories,
or don't care, can pass a flag to turn on more specific
messages.
Signed-off-by: Jeff King <peff@xxxxxxxx>
---
Minor tweaks to the documentation and code style to make Jonathan happy.
:)
Note: I labeled this "v3", as it is the third one posted, but the prior
ones were not labeled with versions at all.
Documentation/git-daemon.txt | 10 ++++++++++
daemon.c | 25 +++++++++++++++++++++----
2 files changed, 31 insertions(+), 4 deletions(-)
diff --git a/Documentation/git-daemon.txt b/Documentation/git-daemon.txt
index 69a1e4a..31b28fc 100644
--- a/Documentation/git-daemon.txt
+++ b/Documentation/git-daemon.txt
@@ -161,6 +161,16 @@ the facility of inet daemon to achieve the same before spawning
repository configuration. By default, all the services
are overridable.
+--informative-errors::
+--no-informative-errors::
+ When informative errors are turned on, git-daemon will report
+ more verbose errors to the client, differentiating conditions
+ like "no such repository" from "repository not exported". This
+ is more convenient for clients, but may leak information about
+ the existence of unexported repositories. When informative
+ errors are not enabled, all errors report "access denied" to the
+ client. The default is --no-informative-errors.
+
<directory>::
A directory to add to the whitelist of allowed directories. Unless
--strict-paths is specified this will also include subdirectories
diff --git a/daemon.c b/daemon.c
index 4c8346d..6f111af 100644
--- a/daemon.c
+++ b/daemon.c
@@ -20,6 +20,7 @@
static int log_syslog;
static int verbose;
static int reuseaddr;
+static int informative_errors;
static const char daemon_usage[] =
"git daemon [--verbose] [--syslog] [--export-all]\n"
@@ -247,6 +248,14 @@ static int git_daemon_config(const char *var, const char *value, void *cb)
return 0;
}
+static int daemon_error(const char *dir, const char *msg)
+{
+ if (!informative_errors)
+ msg = "access denied";
+ packet_write(1, "ERR %s: %s", msg, dir);
+ return -1;
+}
+
static int run_service(char *dir, struct daemon_service *service)
{
const char *path;
@@ -257,11 +266,11 @@ static int run_service(char *dir, struct daemon_service *service)
if (!enabled && !service->overridable) {
logerror("'%s': service not enabled.", service->name);
errno = EACCES;
- return -1;
+ return daemon_error(dir, "service not enabled");
}
if (!(path = path_ok(dir)))
- return -1;
+ return daemon_error(dir, "no such repository");
/*
* Security on the cheap.
@@ -277,7 +286,7 @@ static int run_service(char *dir, struct daemon_service *service)
if (!export_all_trees && access("git-daemon-export-ok", F_OK)) {
logerror("'%s': repository not exported.", path);
errno = EACCES;
- return -1;
+ return daemon_error(dir, "repository not exported");
}
if (service->overridable) {
@@ -291,7 +300,7 @@ static int run_service(char *dir, struct daemon_service *service)
logerror("'%s': service not enabled for '%s'",
service->name, path);
errno = EACCES;
- return -1;
+ return daemon_error(dir, "service not enabled");
}
/*
@@ -1167,6 +1176,14 @@ int main(int argc, char **argv)
make_service_overridable(arg + 18, 0);
continue;
}
+ if (!prefixcmp(arg, "--informative-errors")) {
+ informative_errors = 1;
+ continue;
+ }
+ if (!prefixcmp(arg, "--no-informative-errors")) {
+ informative_errors = 0;
+ continue;
+ }
if (!strcmp(arg, "--")) {
ok_paths = &argv[i+1];
break;
--
1.7.6.4.37.g43b58b
--
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