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Merge branch 'jc/daemon-access-hook'
Allow an external command to tell git-daemon to decline service based on the client address, repository path, etc. * jc/daemon-access-hook: daemon: --access-hook option
This commit is contained in:
commit
19801d6a27
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@ -16,6 +16,7 @@ SYNOPSIS
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[--reuseaddr] [--detach] [--pid-file=<file>]
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[--enable=<service>] [--disable=<service>]
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[--allow-override=<service>] [--forbid-override=<service>]
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[--access-hook=<path>]
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[--inetd | [--listen=<host_or_ipaddr>] [--port=<n>] [--user=<user> [--group=<group>]]
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[<directory>...]
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@ -171,6 +172,21 @@ the facility of inet daemon to achieve the same before spawning
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errors are not enabled, all errors report "access denied" to the
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client. The default is --no-informative-errors.
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--access-hook=<path>::
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Every time a client connects, first run an external command
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specified by the <path> with service name (e.g. "upload-pack"),
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path to the repository, hostname (%H), canonical hostname
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(%CH), ip address (%IP), and tcp port (%P) as its command line
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arguments. The external command can decide to decline the
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service by exiting with a non-zero status (or to allow it by
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exiting with a zero status). It can also look at the $REMOTE_ADDR
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and $REMOTE_PORT environment variables to learn about the
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requestor when making this decision.
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+
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The external command can optionally write a single line to its
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standard output to be sent to the requestor as an error message when
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it declines the service.
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<directory>::
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A directory to add to the whitelist of allowed directories. Unless
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--strict-paths is specified this will also include subdirectories
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77
daemon.c
77
daemon.c
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@ -30,6 +30,7 @@ static const char daemon_usage[] =
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" [--interpolated-path=<path>]\n"
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" [--reuseaddr] [--pid-file=<file>]\n"
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" [--(enable|disable|allow-override|forbid-override)=<service>]\n"
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" [--access-hook=<path>]\n"
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" [--inetd | [--listen=<host_or_ipaddr>] [--port=<n>]\n"
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" [--detach] [--user=<user> [--group=<group>]]\n"
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" [<directory>...]";
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@ -256,6 +257,71 @@ static int daemon_error(const char *dir, const char *msg)
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return -1;
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}
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static char *access_hook;
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static int run_access_hook(struct daemon_service *service, const char *dir, const char *path)
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{
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struct child_process child;
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struct strbuf buf = STRBUF_INIT;
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const char *argv[8];
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const char **arg = argv;
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char *eol;
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int seen_errors = 0;
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#define STRARG(x) ((x) ? (x) : "")
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*arg++ = access_hook;
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*arg++ = service->name;
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*arg++ = path;
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*arg++ = STRARG(hostname);
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*arg++ = STRARG(canon_hostname);
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*arg++ = STRARG(ip_address);
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*arg++ = STRARG(tcp_port);
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*arg = NULL;
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#undef STRARG
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memset(&child, 0, sizeof(child));
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child.use_shell = 1;
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child.argv = argv;
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child.no_stdin = 1;
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child.no_stderr = 1;
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child.out = -1;
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if (start_command(&child)) {
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logerror("daemon access hook '%s' failed to start",
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access_hook);
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goto error_return;
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}
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if (strbuf_read(&buf, child.out, 0) < 0) {
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logerror("failed to read from pipe to daemon access hook '%s'",
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access_hook);
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strbuf_reset(&buf);
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seen_errors = 1;
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}
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if (close(child.out) < 0) {
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logerror("failed to close pipe to daemon access hook '%s'",
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access_hook);
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seen_errors = 1;
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}
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if (finish_command(&child))
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seen_errors = 1;
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if (!seen_errors) {
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strbuf_release(&buf);
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return 0;
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}
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error_return:
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strbuf_ltrim(&buf);
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if (!buf.len)
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strbuf_addstr(&buf, "service rejected");
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eol = strchr(buf.buf, '\n');
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if (eol)
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*eol = '\0';
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errno = EACCES;
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daemon_error(dir, buf.buf);
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strbuf_release(&buf);
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return -1;
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}
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static int run_service(char *dir, struct daemon_service *service)
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{
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const char *path;
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@ -303,6 +369,13 @@ static int run_service(char *dir, struct daemon_service *service)
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return daemon_error(dir, "service not enabled");
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}
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/*
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* Optionally, a hook can choose to deny access to the
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* repository depending on the phase of the moon.
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*/
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if (access_hook && run_access_hook(service, dir, path))
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return -1;
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/*
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* We'll ignore SIGTERM from now on, we have a
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* good client.
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@ -1142,6 +1215,10 @@ int main(int argc, char **argv)
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export_all_trees = 1;
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continue;
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}
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if (!prefixcmp(arg, "--access-hook=")) {
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access_hook = arg + 14;
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continue;
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}
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if (!prefixcmp(arg, "--timeout=")) {
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timeout = atoi(arg+10);
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continue;
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