mirror of
https://github.com/git/git
synced 2024-08-28 20:20:07 +00:00
![Serge E. Hallyn](/assets/img/avatar_default.png)
The set_reuse_addr() error case was the only error case in socklist() where we returned rather than continued. Not sure why. Either we must free the socklist, or continue. This patch continues on error. Signed-off-by: Serge E. Hallyn <serue@us.ibm.com> Signed-off-by: Junio C Hamano <junkio@cox.net>
755 lines
16 KiB
C
755 lines
16 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] [directory...]";
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/* List of acceptable pathname prefixes */
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static char **ok_paths = NULL;
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static int strict_paths = 0;
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/* If this is set, git-daemon-export-ok is not required */
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static int export_all_trees = 0;
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/* Take all paths relative to this one if non-NULL */
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static char *base_path = NULL;
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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 char *user_path = NULL;
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/* Timeout, and initial timeout */
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static unsigned int timeout = 0;
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static unsigned int init_timeout = 0;
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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 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(void)
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{
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static char line[1000];
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int len;
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alarm(init_timeout ? init_timeout : timeout);
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len = packet_read_line(0, line, sizeof(line));
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alarm(0);
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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 = 0;
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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 = 0;
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static unsigned int children_deleted = 0;
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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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char addrbuf[256] = "";
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int port = -1;
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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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if (addr->sa_family == AF_INET) {
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struct sockaddr_in *sin_addr = (void *) addr;
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inet_ntop(AF_INET, &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->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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exit(execute());
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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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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
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if (ai->ai_family == AF_INET6) {
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int on = 1;
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setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY,
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&on, sizeof(on));
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/* Note: error is not fatal */
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}
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#endif
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if (set_reuse_addr(sockfd)) {
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close(sockfd);
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continue;
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}
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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);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
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;
|
|
int i;
|
|
|
|
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 (!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);
|
|
|
|
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();
|
|
}
|
|
|
|
return serve(port);
|
|
}
|