-#include "cache.h"
-#include "pkt-line.h"
-#include <alloca.h>
#include <signal.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <syslog.h>
+#include "pkt-line.h"
+#include "cache.h"
+#include "exec_cmd.h"
static int log_syslog;
static int verbose;
+static int reuseaddr;
-static const char daemon_usage[] = "git-daemon [--verbose] [--syslog] [--inetd | --port=n] [--export-all] [directory...]";
+static const char daemon_usage[] =
+"git-daemon [--verbose] [--syslog] [--inetd | --port=n] [--export-all]\n"
+" [--timeout=n] [--init-timeout=n] [--strict-paths]\n"
+" [--base-path=path] [--user-path | --user-path=path]\n"
+" [--reuseaddr] [directory...]";
/* List of acceptable pathname prefixes */
static char **ok_paths = NULL;
+static int strict_paths = 0;
/* If this is set, git-daemon-export-ok is not required */
static int export_all_trees = 0;
+/* Take all paths relative to this one if non-NULL */
+static char *base_path = NULL;
+
+/* If defined, ~user notation is allowed and the string is inserted
+ * after ~user/. E.g. a request to git://host/~alice/frotz would
+ * go to /home/alice/pub_git/frotz with --user-path=pub_git.
+ */
+static char *user_path = NULL;
+
+/* Timeout, and initial timeout */
+static unsigned int timeout = 0;
+static unsigned int init_timeout = 0;
static void logreport(int priority, const char *err, va_list params)
{
write(2, buf, buflen);
}
-void logerror(const char *err, ...)
+static void logerror(const char *err, ...)
{
va_list params;
va_start(params, err);
va_end(params);
}
-void loginfo(const char *err, ...)
+static void loginfo(const char *err, ...)
{
va_list params;
if (!verbose)
va_end(params);
}
-static int path_ok(const char *dir)
+static int avoid_alias(char *p)
{
- const char *p = dir;
- char **pp;
- int sl = 1, ndot = 0;
+ int sl, ndot;
- for (;;) {
- if ( *p == '.' ) {
- ndot++;
- } else if ( *p == '/' || *p == '\0' ) {
- if ( sl && ndot > 0 && ndot < 3 )
- return 0; /* . or .. in path */
+ /*
+ * This resurrects the belts and suspenders paranoia check by HPA
+ * done in <435560F7.4080006@zytor.com> thread, now enter_repo()
+ * does not do getcwd() based path canonicalizations.
+ *
+ * sl becomes true immediately after seeing '/' and continues to
+ * be true as long as dots continue after that without intervening
+ * non-dot character.
+ */
+ if (!p || (*p != '/' && *p != '~'))
+ return -1;
+ sl = 1; ndot = 0;
+ p++;
+
+ while (1) {
+ char ch = *p++;
+ if (sl) {
+ if (ch == '.')
+ ndot++;
+ else if (ch == '/') {
+ if (ndot < 3)
+ /* reject //, /./ and /../ */
+ return -1;
+ ndot = 0;
+ }
+ else if (ch == 0) {
+ if (0 < ndot && ndot < 3)
+ /* reject /.$ and /..$ */
+ return -1;
+ return 0;
+ }
+ else
+ sl = ndot = 0;
+ }
+ else if (ch == 0)
+ return 0;
+ else if (ch == '/') {
sl = 1;
- if ( *p == '\0' )
- break; /* End of string and all is good */
- } else {
- sl = ndot = 0;
+ ndot = 0;
}
- p++;
}
+}
- if ( ok_paths && *ok_paths ) {
- int ok = 0;
- int dirlen = strlen(dir); /* read_packet_line can return embedded \0 */
+static char *path_ok(char *dir)
+{
+ static char rpath[PATH_MAX];
+ char *path;
+ if (avoid_alias(dir)) {
+ logerror("'%s': aliased", dir);
+ return NULL;
+ }
+
+ if (*dir == '~') {
+ if (!user_path) {
+ logerror("'%s': User-path not allowed", dir);
+ return NULL;
+ }
+ if (*user_path) {
+ /* Got either "~alice" or "~alice/foo";
+ * rewrite them to "~alice/%s" or
+ * "~alice/%s/foo".
+ */
+ int namlen, restlen = strlen(dir);
+ char *slash = strchr(dir, '/');
+ if (!slash)
+ slash = dir + restlen;
+ namlen = slash - dir;
+ restlen -= namlen;
+ loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash);
+ snprintf(rpath, PATH_MAX, "%.*s/%s%.*s",
+ namlen, dir, user_path, restlen, slash);
+ dir = rpath;
+ }
+ }
+ else if (base_path) {
+ if (*dir != '/') {
+ /* Allow only absolute */
+ logerror("'%s': Non-absolute path denied (base-path active)", dir);
+ return NULL;
+ }
+ else {
+ snprintf(rpath, PATH_MAX, "%s%s", base_path, dir);
+ dir = rpath;
+ }
+ }
+
+ path = enter_repo(dir, strict_paths);
+
+ if (!path) {
+ logerror("'%s': unable to chdir or not a git archive", dir);
+ return NULL;
+ }
+
+ if ( ok_paths && *ok_paths ) {
+ char **pp;
+ int pathlen = strlen(path);
+
+ /* The validation is done on the paths after enter_repo
+ * appends optional {.git,.git/.git} and friends, but
+ * it does not use getcwd(). So if your /pub is
+ * a symlink to /mnt/pub, you can whitelist /pub and
+ * do not have to say /mnt/pub.
+ * Do not say /pub/.
+ */
for ( pp = ok_paths ; *pp ; pp++ ) {
int len = strlen(*pp);
- if ( len <= dirlen &&
- !strncmp(*pp, dir, len) &&
- (dir[len] == '/' || dir[len] == '\0') ) {
- ok = 1;
- break;
- }
+ if (len <= pathlen &&
+ !memcmp(*pp, path, len) &&
+ (path[len] == '\0' ||
+ (!strict_paths && path[len] == '/')))
+ return path;
}
-
- if ( !ok )
- return 0; /* Path not in whitelist */
+ }
+ else {
+ /* be backwards compatible */
+ if (!strict_paths)
+ return path;
}
- return 1; /* Path acceptable */
+ logerror("'%s': not in whitelist", path);
+ return NULL; /* Fallthrough. Deny by default */
}
-static int upload(char *dir, int dirlen)
+static int upload(char *dir)
{
- loginfo("Request for '%s'", dir);
+ /* Timeout as string */
+ char timeout_buf[64];
+ const char *path;
- if (!path_ok(dir)) {
- logerror("Forbidden directory: %s\n", dir);
- return -1;
- }
+ loginfo("Request for '%s'", dir);
- if (chdir(dir) < 0) {
- logerror("Cannot chdir('%s'): %s", dir, strerror(errno));
+ if (!(path = path_ok(dir)))
return -1;
- }
-
- chdir(".git");
/*
* Security on the cheap.
*
- * We want a readable HEAD, usable "objects" directory, and
+ * We want a readable HEAD, usable "objects" directory, and
* a "git-daemon-export-ok" flag that says that the other side
* is ok with us doing this.
+ *
+ * path_ok() uses enter_repo() and does whitelist checking.
+ * We only need to make sure the repository is exported.
*/
- if ((!export_all_trees && access("git-daemon-export-ok", F_OK)) ||
- access("objects/00", X_OK) ||
- access("HEAD", R_OK)) {
- logerror("Not a valid git-daemon-enabled repository: '%s'", dir);
+
+ if (!export_all_trees && access("git-daemon-export-ok", F_OK)) {
+ logerror("'%s': repository not exported.", path);
+ errno = EACCES;
return -1;
}
*/
signal(SIGTERM, SIG_IGN);
+ snprintf(timeout_buf, sizeof timeout_buf, "--timeout=%u", timeout);
+
/* git-upload-pack only ever reads stuff, so this is safe */
- execlp("git-upload-pack", "git-upload-pack", ".", NULL);
+ execl_git_cmd("upload-pack", "--strict", timeout_buf, ".", NULL);
return -1;
}
static char line[1000];
int len;
+ alarm(init_timeout ? init_timeout : timeout);
len = packet_read_line(0, line, sizeof(line));
+ alarm(0);
if (len && line[len-1] == '\n')
line[--len] = 0;
- if (!strncmp("git-upload-pack /", line, 17))
- return upload(line + 16, len - 16);
+ if (!strncmp("git-upload-pack ", line, 16))
+ return upload(line+16);
logerror("Protocol error: '%s'", line);
return -1;
}
}
+static int set_reuse_addr(int sockfd)
+{
+ int on = 1;
+
+ if (!reuseaddr)
+ return 0;
+ return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
+ &on, sizeof(on));
+}
+
#ifndef NO_IPV6
static int socksetup(int port, int **socklist_p)
}
#endif
+ if (set_reuse_addr(sockfd)) {
+ close(sockfd);
+ return 0; /* not fatal */
+ }
+
if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
close(sockfd);
continue; /* not fatal */
sin.sin_addr.s_addr = htonl(INADDR_ANY);
sin.sin_port = htons(port);
+ if (set_reuse_addr(sockfd)) {
+ close(sockfd);
+ return 0;
+ }
+
if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) {
close(sockfd);
return 0;
}
- *socklist_p = malloc(sizeof(int));
- if ( !*socklist_p )
- die("memory allocation failed: %s", strerror(errno));
+ if (listen(sockfd, 5) < 0) {
+ close(sockfd);
+ return 0;
+ }
+
+ *socklist_p = xmalloc(sizeof(int));
**socklist_p = sockfd;
+ return 1;
}
#endif
struct pollfd *pfd;
int i;
- pfd = calloc(socknum, sizeof(struct pollfd));
- if (!pfd)
- die("memory allocation failed: %s", strerror(errno));
+ pfd = xcalloc(socknum, sizeof(struct pollfd));
for (i = 0; i < socknum; i++) {
pfd[i].fd = socklist[i];
pfd[i].events = POLLIN;
}
-
+
+ signal(SIGCHLD, child_handler);
+
for (;;) {
int i;
- if (poll(pfd, socknum, 0) < 0) {
+ if (poll(pfd, socknum, -1) < 0) {
if (errno != EINTR) {
error("poll failed, resuming: %s",
strerror(errno));
for (i = 0; i < socknum; i++) {
if (pfd[i].revents & POLLIN) {
struct sockaddr_storage ss;
- int sslen = sizeof(ss);
+ unsigned int sslen = sizeof(ss);
int incoming = accept(pfd[i].fd, (struct sockaddr *)&ss, &sslen);
if (incoming < 0) {
switch (errno) {
static int serve(int port)
{
int socknum, *socklist;
-
- signal(SIGCHLD, child_handler);
-
+
socknum = socksetup(port, &socklist);
if (socknum == 0)
die("unable to allocate any listen sockets on port %u", port);
-
+
return service_loop(socknum, socklist);
-}
+}
int main(int argc, char **argv)
{
}
if (!strcmp(arg, "--inetd")) {
inetd_mode = 1;
+ log_syslog = 1;
continue;
}
if (!strcmp(arg, "--verbose")) {
}
if (!strcmp(arg, "--syslog")) {
log_syslog = 1;
- openlog("git-daemon", 0, LOG_DAEMON);
continue;
}
if (!strcmp(arg, "--export-all")) {
export_all_trees = 1;
continue;
}
+ if (!strncmp(arg, "--timeout=", 10)) {
+ timeout = atoi(arg+10);
+ continue;
+ }
+ if (!strncmp(arg, "--init-timeout=", 15)) {
+ init_timeout = atoi(arg+15);
+ continue;
+ }
+ if (!strcmp(arg, "--strict-paths")) {
+ strict_paths = 1;
+ continue;
+ }
+ if (!strncmp(arg, "--base-path=", 12)) {
+ base_path = arg+12;
+ continue;
+ }
+ if (!strcmp(arg, "--reuseaddr")) {
+ reuseaddr = 1;
+ continue;
+ }
+ if (!strcmp(arg, "--user-path")) {
+ user_path = "";
+ continue;
+ }
+ if (!strncmp(arg, "--user-path=", 12)) {
+ user_path = arg + 12;
+ continue;
+ }
if (!strcmp(arg, "--")) {
ok_paths = &argv[i+1];
break;
usage(daemon_usage);
}
+ if (log_syslog)
+ openlog("git-daemon", 0, LOG_DAEMON);
+
+ if (strict_paths && (!ok_paths || !*ok_paths)) {
+ if (!inetd_mode)
+ die("git-daemon: option --strict-paths requires a whitelist");
+
+ logerror("option --strict-paths requires a whitelist");
+ exit (1);
+ }
+
if (inetd_mode) {
fclose(stderr); //FIXME: workaround
return execute();
- } else {
- return serve(port);
}
+
+ return serve(port);
}