mirror of
https://github.com/git/git
synced 2024-08-28 20:20:07 +00:00
![David Rientjes](/assets/img/avatar_default.png)
[jc: I needed to hand merge the changes to the updated codebase, so the result needs to be checked.] Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Junio C Hamano <junkio@cox.net>
836 lines
18 KiB
C
836 lines
18 KiB
C
#include <signal.h>
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#include <sys/wait.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <sys/poll.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <syslog.h>
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#include "pkt-line.h"
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#include "cache.h"
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#include "exec_cmd.h"
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static int log_syslog;
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static int verbose;
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static int reuseaddr;
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static const char daemon_usage[] =
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"git-daemon [--verbose] [--syslog] [--inetd | --port=n] [--export-all]\n"
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" [--timeout=n] [--init-timeout=n] [--strict-paths]\n"
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" [--base-path=path] [--user-path | --user-path=path]\n"
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" [--reuseaddr] [--detach] [--pid-file=file] [directory...]";
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/* List of acceptable pathname prefixes */
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static char **ok_paths;
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static int strict_paths;
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/* If this is set, git-daemon-export-ok is not required */
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static int export_all_trees;
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/* Take all paths relative to this one if non-NULL */
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static char *base_path;
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/* If defined, ~user notation is allowed and the string is inserted
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* after ~user/. E.g. a request to git://host/~alice/frotz would
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* go to /home/alice/pub_git/frotz with --user-path=pub_git.
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*/
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static const char *user_path;
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/* Timeout, and initial timeout */
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static unsigned int timeout;
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static unsigned int init_timeout;
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static void logreport(int priority, const char *err, va_list params)
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{
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/* We should do a single write so that it is atomic and output
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* of several processes do not get intermingled. */
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char buf[1024];
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int buflen;
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int maxlen, msglen;
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/* sizeof(buf) should be big enough for "[pid] \n" */
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buflen = snprintf(buf, sizeof(buf), "[%ld] ", (long) getpid());
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maxlen = sizeof(buf) - buflen - 1; /* -1 for our own LF */
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msglen = vsnprintf(buf + buflen, maxlen, err, params);
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if (log_syslog) {
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syslog(priority, "%s", buf);
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return;
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}
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/* maxlen counted our own LF but also counts space given to
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* vsnprintf for the terminating NUL. We want to make sure that
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* we have space for our own LF and NUL after the "meat" of the
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* message, so truncate it at maxlen - 1.
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*/
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if (msglen > maxlen - 1)
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msglen = maxlen - 1;
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else if (msglen < 0)
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msglen = 0; /* Protect against weird return values. */
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buflen += msglen;
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buf[buflen++] = '\n';
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buf[buflen] = '\0';
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write(2, buf, buflen);
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}
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static void logerror(const char *err, ...)
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{
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va_list params;
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va_start(params, err);
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logreport(LOG_ERR, err, params);
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va_end(params);
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}
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static void loginfo(const char *err, ...)
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{
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va_list params;
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if (!verbose)
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return;
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va_start(params, err);
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logreport(LOG_INFO, err, params);
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va_end(params);
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}
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static void NORETURN daemon_die(const char *err, va_list params)
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{
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logreport(LOG_ERR, err, params);
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exit(1);
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}
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static int avoid_alias(char *p)
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{
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int sl, ndot;
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/*
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* This resurrects the belts and suspenders paranoia check by HPA
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* done in <435560F7.4080006@zytor.com> thread, now enter_repo()
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* does not do getcwd() based path canonicalizations.
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*
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* sl becomes true immediately after seeing '/' and continues to
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* be true as long as dots continue after that without intervening
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* non-dot character.
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*/
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if (!p || (*p != '/' && *p != '~'))
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return -1;
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sl = 1; ndot = 0;
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p++;
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while (1) {
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char ch = *p++;
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if (sl) {
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if (ch == '.')
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ndot++;
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else if (ch == '/') {
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if (ndot < 3)
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/* reject //, /./ and /../ */
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return -1;
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ndot = 0;
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}
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else if (ch == 0) {
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if (0 < ndot && ndot < 3)
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/* reject /.$ and /..$ */
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return -1;
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return 0;
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}
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else
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sl = ndot = 0;
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}
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else if (ch == 0)
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return 0;
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else if (ch == '/') {
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sl = 1;
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ndot = 0;
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}
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}
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}
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static char *path_ok(char *dir)
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{
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static char rpath[PATH_MAX];
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char *path;
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if (avoid_alias(dir)) {
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logerror("'%s': aliased", dir);
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return NULL;
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}
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if (*dir == '~') {
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if (!user_path) {
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logerror("'%s': User-path not allowed", dir);
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return NULL;
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}
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if (*user_path) {
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/* Got either "~alice" or "~alice/foo";
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* rewrite them to "~alice/%s" or
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* "~alice/%s/foo".
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*/
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int namlen, restlen = strlen(dir);
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char *slash = strchr(dir, '/');
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if (!slash)
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slash = dir + restlen;
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namlen = slash - dir;
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restlen -= namlen;
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loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash);
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snprintf(rpath, PATH_MAX, "%.*s/%s%.*s",
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namlen, dir, user_path, restlen, slash);
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dir = rpath;
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}
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}
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else if (base_path) {
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if (*dir != '/') {
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/* Allow only absolute */
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logerror("'%s': Non-absolute path denied (base-path active)", dir);
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return NULL;
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}
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else {
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snprintf(rpath, PATH_MAX, "%s%s", base_path, dir);
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dir = rpath;
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}
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}
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path = enter_repo(dir, strict_paths);
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if (!path) {
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logerror("'%s': unable to chdir or not a git archive", dir);
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return NULL;
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}
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if ( ok_paths && *ok_paths ) {
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char **pp;
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int pathlen = strlen(path);
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/* The validation is done on the paths after enter_repo
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* appends optional {.git,.git/.git} and friends, but
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* it does not use getcwd(). So if your /pub is
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* a symlink to /mnt/pub, you can whitelist /pub and
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* do not have to say /mnt/pub.
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* Do not say /pub/.
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*/
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for ( pp = ok_paths ; *pp ; pp++ ) {
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int len = strlen(*pp);
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if (len <= pathlen &&
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!memcmp(*pp, path, len) &&
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(path[len] == '\0' ||
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(!strict_paths && path[len] == '/')))
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return path;
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}
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}
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else {
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/* be backwards compatible */
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if (!strict_paths)
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return path;
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}
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logerror("'%s': not in whitelist", path);
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return NULL; /* Fallthrough. Deny by default */
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}
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static int upload(char *dir)
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{
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/* Timeout as string */
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char timeout_buf[64];
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const char *path;
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loginfo("Request for '%s'", dir);
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if (!(path = path_ok(dir)))
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return -1;
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/*
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* Security on the cheap.
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*
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* We want a readable HEAD, usable "objects" directory, and
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* a "git-daemon-export-ok" flag that says that the other side
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* is ok with us doing this.
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*
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* path_ok() uses enter_repo() and does whitelist checking.
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* We only need to make sure the repository is exported.
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*/
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if (!export_all_trees && access("git-daemon-export-ok", F_OK)) {
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logerror("'%s': repository not exported.", path);
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errno = EACCES;
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return -1;
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}
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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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*/
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signal(SIGTERM, SIG_IGN);
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snprintf(timeout_buf, sizeof timeout_buf, "--timeout=%u", timeout);
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/* git-upload-pack only ever reads stuff, so this is safe */
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execl_git_cmd("upload-pack", "--strict", timeout_buf, ".", NULL);
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return -1;
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}
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static int execute(struct sockaddr *addr)
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{
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static char line[1000];
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int pktlen, len;
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if (addr) {
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char addrbuf[256] = "";
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int port = -1;
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if (addr->sa_family == AF_INET) {
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struct sockaddr_in *sin_addr = (void *) addr;
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inet_ntop(addr->sa_family, &sin_addr->sin_addr, addrbuf, sizeof(addrbuf));
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port = sin_addr->sin_port;
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#ifndef NO_IPV6
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} else if (addr && addr->sa_family == AF_INET6) {
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struct sockaddr_in6 *sin6_addr = (void *) addr;
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char *buf = addrbuf;
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*buf++ = '['; *buf = '\0'; /* stpcpy() is cool */
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inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(addrbuf) - 1);
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strcat(buf, "]");
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port = sin6_addr->sin6_port;
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#endif
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}
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loginfo("Connection from %s:%d", addrbuf, port);
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}
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alarm(init_timeout ? init_timeout : timeout);
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pktlen = packet_read_line(0, line, sizeof(line));
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alarm(0);
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len = strlen(line);
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if (pktlen != len)
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loginfo("Extended attributes (%d bytes) exist <%.*s>",
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(int) pktlen - len,
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(int) pktlen - len, line + len + 1);
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if (len && line[len-1] == '\n')
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line[--len] = 0;
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if (!strncmp("git-upload-pack ", line, 16))
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return upload(line+16);
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logerror("Protocol error: '%s'", line);
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return -1;
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}
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/*
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* We count spawned/reaped separately, just to avoid any
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* races when updating them from signals. The SIGCHLD handler
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* will only update children_reaped, and the fork logic will
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* only update children_spawned.
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*
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* MAX_CHILDREN should be a power-of-two to make the modulus
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* operation cheap. It should also be at least twice
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* the maximum number of connections we will ever allow.
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*/
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#define MAX_CHILDREN 128
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static int max_connections = 25;
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/* These are updated by the signal handler */
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static volatile unsigned int children_reaped;
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static pid_t dead_child[MAX_CHILDREN];
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/* These are updated by the main loop */
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static unsigned int children_spawned;
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static unsigned int children_deleted;
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static struct child {
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pid_t pid;
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int addrlen;
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struct sockaddr_storage address;
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} live_child[MAX_CHILDREN];
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static void add_child(int idx, pid_t pid, struct sockaddr *addr, int addrlen)
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{
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live_child[idx].pid = pid;
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live_child[idx].addrlen = addrlen;
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memcpy(&live_child[idx].address, addr, addrlen);
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}
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/*
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* Walk from "deleted" to "spawned", and remove child "pid".
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*
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* We move everything up by one, since the new "deleted" will
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* be one higher.
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*/
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static void remove_child(pid_t pid, unsigned deleted, unsigned spawned)
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{
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struct child n;
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deleted %= MAX_CHILDREN;
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spawned %= MAX_CHILDREN;
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if (live_child[deleted].pid == pid) {
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live_child[deleted].pid = -1;
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return;
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}
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n = live_child[deleted];
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for (;;) {
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struct child m;
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deleted = (deleted + 1) % MAX_CHILDREN;
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if (deleted == spawned)
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die("could not find dead child %d\n", pid);
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m = live_child[deleted];
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live_child[deleted] = n;
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if (m.pid == pid)
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return;
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n = m;
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}
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}
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/*
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* This gets called if the number of connections grows
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* past "max_connections".
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*
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* We _should_ start off by searching for connections
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* from the same IP, and if there is some address wth
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* multiple connections, we should kill that first.
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*
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* As it is, we just "randomly" kill 25% of the connections,
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* and our pseudo-random generator sucks too. I have no
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* shame.
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*
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* Really, this is just a place-holder for a _real_ algorithm.
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*/
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static void kill_some_children(int signo, unsigned start, unsigned stop)
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{
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start %= MAX_CHILDREN;
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stop %= MAX_CHILDREN;
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while (start != stop) {
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if (!(start & 3))
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kill(live_child[start].pid, signo);
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start = (start + 1) % MAX_CHILDREN;
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}
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}
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static void check_max_connections(void)
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{
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for (;;) {
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int active;
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unsigned spawned, reaped, deleted;
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spawned = children_spawned;
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reaped = children_reaped;
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deleted = children_deleted;
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while (deleted < reaped) {
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pid_t pid = dead_child[deleted % MAX_CHILDREN];
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remove_child(pid, deleted, spawned);
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deleted++;
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}
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children_deleted = deleted;
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active = spawned - deleted;
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if (active <= max_connections)
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break;
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/* Kill some unstarted connections with SIGTERM */
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kill_some_children(SIGTERM, deleted, spawned);
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if (active <= max_connections << 1)
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break;
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/* If the SIGTERM thing isn't helping use SIGKILL */
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kill_some_children(SIGKILL, deleted, spawned);
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sleep(1);
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}
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}
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static void handle(int incoming, struct sockaddr *addr, int addrlen)
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{
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pid_t pid = fork();
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if (pid) {
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unsigned idx;
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close(incoming);
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if (pid < 0)
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return;
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idx = children_spawned % MAX_CHILDREN;
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children_spawned++;
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add_child(idx, pid, addr, addrlen);
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check_max_connections();
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return;
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}
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dup2(incoming, 0);
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dup2(incoming, 1);
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close(incoming);
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exit(execute(addr));
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}
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static void child_handler(int signo)
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{
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for (;;) {
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int status;
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pid_t pid = waitpid(-1, &status, WNOHANG);
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if (pid > 0) {
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unsigned reaped = children_reaped;
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dead_child[reaped % MAX_CHILDREN] = pid;
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children_reaped = reaped + 1;
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/* XXX: Custom logging, since we don't wanna getpid() */
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if (verbose) {
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const char *dead = "";
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if (!WIFEXITED(status) || WEXITSTATUS(status) > 0)
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dead = " (with error)";
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if (log_syslog)
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syslog(LOG_INFO, "[%d] Disconnected%s", pid, dead);
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else
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fprintf(stderr, "[%d] Disconnected%s\n", pid, dead);
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}
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continue;
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}
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break;
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}
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}
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static int set_reuse_addr(int sockfd)
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{
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int on = 1;
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if (!reuseaddr)
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return 0;
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return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
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&on, sizeof(on));
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}
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#ifndef NO_IPV6
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static int socksetup(int port, int **socklist_p)
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{
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int socknum = 0, *socklist = NULL;
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int maxfd = -1;
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|
char pbuf[NI_MAXSERV];
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struct addrinfo hints, *ai0, *ai;
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int gai;
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sprintf(pbuf, "%d", port);
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = AF_UNSPEC;
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hints.ai_socktype = SOCK_STREAM;
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hints.ai_protocol = IPPROTO_TCP;
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hints.ai_flags = AI_PASSIVE;
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gai = getaddrinfo(NULL, pbuf, &hints, &ai0);
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if (gai)
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die("getaddrinfo() failed: %s\n", gai_strerror(gai));
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for (ai = ai0; ai; ai = ai->ai_next) {
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int sockfd;
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int *newlist;
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sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
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if (sockfd < 0)
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continue;
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if (sockfd >= FD_SETSIZE) {
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error("too large socket descriptor.");
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close(sockfd);
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continue;
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}
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#ifdef IPV6_V6ONLY
|
|
if (ai->ai_family == AF_INET6) {
|
|
int on = 1;
|
|
setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY,
|
|
&on, sizeof(on));
|
|
/* Note: error is not fatal */
|
|
}
|
|
#endif
|
|
|
|
if (set_reuse_addr(sockfd)) {
|
|
close(sockfd);
|
|
continue;
|
|
}
|
|
|
|
if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
|
|
close(sockfd);
|
|
continue; /* not fatal */
|
|
}
|
|
if (listen(sockfd, 5) < 0) {
|
|
close(sockfd);
|
|
continue; /* not fatal */
|
|
}
|
|
|
|
newlist = realloc(socklist, sizeof(int) * (socknum + 1));
|
|
if (!newlist)
|
|
die("memory allocation failed: %s", strerror(errno));
|
|
|
|
socklist = newlist;
|
|
socklist[socknum++] = sockfd;
|
|
|
|
if (maxfd < sockfd)
|
|
maxfd = sockfd;
|
|
}
|
|
|
|
freeaddrinfo(ai0);
|
|
|
|
*socklist_p = socklist;
|
|
return socknum;
|
|
}
|
|
|
|
#else /* NO_IPV6 */
|
|
|
|
static int socksetup(int port, int **socklist_p)
|
|
{
|
|
struct sockaddr_in sin;
|
|
int sockfd;
|
|
|
|
sockfd = socket(AF_INET, SOCK_STREAM, 0);
|
|
if (sockfd < 0)
|
|
return 0;
|
|
|
|
memset(&sin, 0, sizeof sin);
|
|
sin.sin_family = AF_INET;
|
|
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;
|
|
}
|
|
|
|
if (listen(sockfd, 5) < 0) {
|
|
close(sockfd);
|
|
return 0;
|
|
}
|
|
|
|
*socklist_p = xmalloc(sizeof(int));
|
|
**socklist_p = sockfd;
|
|
return 1;
|
|
}
|
|
|
|
#endif
|
|
|
|
static int service_loop(int socknum, int *socklist)
|
|
{
|
|
struct pollfd *pfd;
|
|
int i;
|
|
|
|
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, -1) < 0) {
|
|
if (errno != EINTR) {
|
|
error("poll failed, resuming: %s",
|
|
strerror(errno));
|
|
sleep(1);
|
|
}
|
|
continue;
|
|
}
|
|
|
|
for (i = 0; i < socknum; i++) {
|
|
if (pfd[i].revents & POLLIN) {
|
|
struct sockaddr_storage ss;
|
|
unsigned int sslen = sizeof(ss);
|
|
int incoming = accept(pfd[i].fd, (struct sockaddr *)&ss, &sslen);
|
|
if (incoming < 0) {
|
|
switch (errno) {
|
|
case EAGAIN:
|
|
case EINTR:
|
|
case ECONNABORTED:
|
|
continue;
|
|
default:
|
|
die("accept returned %s", strerror(errno));
|
|
}
|
|
}
|
|
handle(incoming, (struct sockaddr *)&ss, sslen);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* if any standard file descriptor is missing open it to /dev/null */
|
|
static void sanitize_stdfds(void)
|
|
{
|
|
int fd = open("/dev/null", O_RDWR, 0);
|
|
while (fd != -1 && fd < 2)
|
|
fd = dup(fd);
|
|
if (fd == -1)
|
|
die("open /dev/null or dup failed: %s", strerror(errno));
|
|
if (fd > 2)
|
|
close(fd);
|
|
}
|
|
|
|
static void daemonize(void)
|
|
{
|
|
switch (fork()) {
|
|
case 0:
|
|
break;
|
|
case -1:
|
|
die("fork failed: %s", strerror(errno));
|
|
default:
|
|
exit(0);
|
|
}
|
|
if (setsid() == -1)
|
|
die("setsid failed: %s", strerror(errno));
|
|
close(0);
|
|
close(1);
|
|
close(2);
|
|
sanitize_stdfds();
|
|
}
|
|
|
|
static void store_pid(const char *path)
|
|
{
|
|
FILE *f = fopen(path, "w");
|
|
if (!f)
|
|
die("cannot open pid file %s: %s", path, strerror(errno));
|
|
fprintf(f, "%d\n", getpid());
|
|
fclose(f);
|
|
}
|
|
|
|
static int serve(int port)
|
|
{
|
|
int socknum, *socklist;
|
|
|
|
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)
|
|
{
|
|
int port = DEFAULT_GIT_PORT;
|
|
int inetd_mode = 0;
|
|
const char *pid_file = NULL;
|
|
int detach = 0;
|
|
int i;
|
|
|
|
/* Without this we cannot rely on waitpid() to tell
|
|
* what happened to our children.
|
|
*/
|
|
signal(SIGCHLD, SIG_DFL);
|
|
|
|
for (i = 1; i < argc; i++) {
|
|
char *arg = argv[i];
|
|
|
|
if (!strncmp(arg, "--port=", 7)) {
|
|
char *end;
|
|
unsigned long n;
|
|
n = strtoul(arg+7, &end, 0);
|
|
if (arg[7] && !*end) {
|
|
port = n;
|
|
continue;
|
|
}
|
|
}
|
|
if (!strcmp(arg, "--inetd")) {
|
|
inetd_mode = 1;
|
|
log_syslog = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--verbose")) {
|
|
verbose = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--syslog")) {
|
|
log_syslog = 1;
|
|
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 (!strncmp(arg, "--pid-file=", 11)) {
|
|
pid_file = arg + 11;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--detach")) {
|
|
detach = 1;
|
|
log_syslog = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--")) {
|
|
ok_paths = &argv[i+1];
|
|
break;
|
|
} else if (arg[0] != '-') {
|
|
ok_paths = &argv[i];
|
|
break;
|
|
}
|
|
|
|
usage(daemon_usage);
|
|
}
|
|
|
|
if (log_syslog) {
|
|
openlog("git-daemon", 0, LOG_DAEMON);
|
|
set_die_routine(daemon_die);
|
|
}
|
|
|
|
if (strict_paths && (!ok_paths || !*ok_paths))
|
|
die("option --strict-paths requires a whitelist");
|
|
|
|
if (inetd_mode) {
|
|
struct sockaddr_storage ss;
|
|
struct sockaddr *peer = (struct sockaddr *)&ss;
|
|
socklen_t slen = sizeof(ss);
|
|
|
|
freopen("/dev/null", "w", stderr);
|
|
|
|
if (getpeername(0, peer, &slen))
|
|
peer = NULL;
|
|
|
|
return execute(peer);
|
|
}
|
|
|
|
if (detach)
|
|
daemonize();
|
|
else
|
|
sanitize_stdfds();
|
|
|
|
if (pid_file)
|
|
store_pid(pid_file);
|
|
|
|
return serve(port);
|
|
}
|